A mean average of 60 on 7 exams is needed to pass a course. On her first 6 ​exams, Sheryl received grades of 47 comma 67 comma 74 comma 62 comma 66 and 76. What grade must she receive on her last exam to pass the​ course?

The coefficient matrix A is [-5/2 4; 3/4 -3].

The characteristic equation is det(A-lambda*I) = 0, where lambda is the eigenvalue and I is the identity matrix. Solving for lambda, we get lambda² - (11/4)lambda - 15/8 = 0. The eigenvalues are lambda1 = (11 + sqrt(161))/8 and lambda2 = (11 - sqrt(161))/8.


To find the eigenvalues of the coefficient matrix A, we need to solve the characteristic equation det(A-lambda*I) = 0. This equation is formed by subtracting lambda times the identity matrix I from A and taking the determinant. The resulting polynomial is of degree 2, so we can use the quadratic formula to find the roots.

In this case, the coefficient matrix A is given as [-5/2 4; 3/4 -3]. We subtract lambda times the identity matrix I = [1 0; 0 1] to get A-lambda*I = [-5/2-lambda 4; 3/4  -3-lambda]. Taking the determinant of this matrix, we get the characteristic equation det(A-lambda*I) = (-5/2-lambda)(-3-lambda) - 4*3/4 = lambda²- (11/4)lambda - 15/8 = 0.

Using the quadratic formula, we can solve for lambda: lambda = (-(11/4) +/- sqrt((11/4)² + 4*15/8))/2. Simplifying, we get lambda1 = (11 + sqrt(161))/8 and lambda2 = (11 - sqrt(161))/8. These are the eigenvalues of the coefficient matrix A.

To know more about characteristic equation click on below link:

https://brainly.com/question/31432979#

#SPJ11

Answer:

no, he did not substitute the formula correctly in step one.

To make population pyramids for the cities in her state, Shania will need the following information: the age and gender of the population, the fertility rates of the population, and the population distribution of the cities.

A population pyramid, also known as an age-sex pyramid, is a visual representation of a population's age and gender composition. It's a graphical representation of population data, with the age cohorts on the vertical axis and the percentage of the population on the horizontal axis. Population pyramids are used to explain demographic variables such as birth rate, life expectancy, and infant mortality rate. They're also utilized to predict the future population size of a region or country.

The following information is required to make a population pyramid: Age and gender of the population: A population pyramid is divided into male and female categories. The age distribution of the population is divided into five-year age cohorts. For example, age cohorts from 0 to 4 years, 5 to 9 years, and so on. Fertility rates of the population: The birth rates of a population are represented by the shape of a pyramid. The number of children born per woman is referred to as the fertility rate. Population distribution of the cities: The population size of a particular location affects the shape of the pyramid.

The population can be divided into urban and rural areas, and their numbers will affect the shape of the pyramid.

To know more about Population pyramids visit:

https://brainly.com/question/32165513

#SPJ11

Given that x follows a binomial distribution with parameters n = 12 and p = 0.15, we can use the following formulas to find the expected value E(x) and variance Var(x):

E(x) = n * p

Var(x) = n * p * (1 - p)

Substituting n = 12 and p = 0.15, we get:

E(x) = 12 * 0.15 = 1.8

Var(x) = 12 * 0.15 * (1 - 0.15) = 1.53

Therefore, the expected value of x is E(x) = 1.8, and the variance of x is Var(x) = 1.53.

To know more about random variables refer here

https://brainly.com/question/30896955

SPJ11

a. To find the 30th percentile for the standard normal distribution, we first need to locate the z-score that corresponds to this percentile. We can use a standard normal distribution table or a calculator to find this value. From the table, we can see that the z-score that corresponds to the 30th percentile is approximately -0.524. Therefore, the 30th percentile for the standard normal distribution is z = -0.524.

b. To find the 30th percentile for a normal distribution with mean 10 and standard deviation 1.5, we can use the formula for transforming a standard normal distribution to a normal distribution with a given mean and standard deviation. This formula is:
z = (x - μ) / σ
where z is the standard normal score, x is the raw score, μ is the mean, and σ is the standard deviation.
To find the 30th percentile for this distribution, we first need to find the corresponding z-score using the formula above:
-0.524 = (x - 10) / 1.5
Multiplying both sides by 1.5, we get:
-0.786 = x - 10
Adding 10 to both sides, we get:
x = 9.214
Therefore, the 30th percentile for a normal distribution with mean 10 and standard deviation 1.5 is x = 9.214. This means that 30% of the observations in this distribution are below 9.214.

Learn more about z-score here

https://brainly.com/question/28000192

#SPJ11

We use the chain rule and the power rule of differentiation and get the value of y' as, [tex]y' = (4x^3 - (15/2)x^{(1/2)}) / ln(6).[/tex]

The given equation defines a function y that is the natural logarithm (base e) of an algebraic expression involving x.

[tex]y = log6(x^4 - 5x^{(3/2)})[/tex]

We can find the derivative of y with respect to x using the chain rule and the power rule of differentiation.

The derivative of y is denoted as y' and is obtained by differentiating the expression inside the logarithm with respect to x, and then multiplying the result by the reciprocal of the natural logarithm of the base.

[tex]y' = (1 / ln(6)) * d/dx (x^4 - 5x^{(3/2}))[/tex]

The final expression for y' involves terms that include the power of x raised to the third and the half power, which can be simplified as necessary.

[tex]y' = (1 / ln(6)) * (4x^3 - (15/2)x^{(1/2)})[/tex]

Therefore, [tex]y' = (4x^3 - (15/2)x^{(1/2)}) / ln(6).[/tex]

To know more about chain rule refer here:

https://brainly.com/question/30117847

#SPJ11

∫_A^B ∫_B^C ∫_D^E (10%)(x^2 + y^2 + z^12) dz dr dθ.

This represents the full iterated integral for F_sav over the given solid cylinder.

(a) The iterated integral for F_sav with the given limits of integration is as follows:

∫∫∫_W (10%)(x^2 + y^2 + z^12) dz dr dθ,

where the limits of integration are A = 0, B = C = 0, D = 6, and E = -1.

(b) To evaluate the integral, we begin with the innermost integration with respect to z. Since z ranges from -1 to 6, the integral becomes:

∫∫_D^E (10%)(x^2 + y^2 + z^12) dz.

Next, we integrate with respect to r, where r represents the radial distance from the z-axis. As the solid cylinder is centered about the z-axis and has a base radius of 6, r ranges from 0 to 6. Thus, the integral becomes:

∫_B^C ∫_D^E (10%)(x^2 + y^2 + z^12) dz dr.

Finally, we integrate with respect to θ, where θ represents the angle around the z-axis. As the cylinder is symmetric about the z-axis, we integrate over a full circle, so θ ranges from 0 to 2π. Hence, the integral becomes:

∫_A^B ∫_B^C ∫_D^E (10%)(x^2 + y^2 + z^12) dz dr dθ.

This represents the full iterated integral for F_sav over the given solid cylinder.

The problem asks for the iterated integral of F_sav over the solid cylinder W. To evaluate this integral, we use the cylindrical coordinate system (r, θ, z) since the cylinder is centered about the z-axis. The function inside the integral is 10% times the sum of squares of x, y, and z^12. By integrating successively with respect to z, r, and θ, and setting appropriate limits of integration, we obtain the final iterated integral. The integration limits are determined based on the given dimensions of the cylinder.

Learn more about solid cylinder here:

https://brainly.com/question/30269341

#SPJ11

The arc length of the curve x = 7 cos ( 7 t ) , y = 7 sin ( 7 t ) with 0 ≤ t ≤ π 14 , we can use the formula:
L = ∫[a,b]√[dx/dt]^2 + [dy/dt]^2 dtThe arc length of the curve x = 7 cos ( 7 t ) , y = 7 sin ( 7 t ) with 0 ≤ t ≤ π 14 , is π/2 units.

Find the arc length of the curve x = 7 cos ( 7 t ) , y = 7 sin ( 7 t ) with 0 ≤ t ≤ π 14 , we can use the formula:
L = ∫[a,b]√[dx/dt]^2 + [dy/dt]^2 dt
where a and b are the limits of integration, and dx/dt and dy/dt are the derivatives of x and y with respect to t.
In this case, we have:
dx/dt = -7 sin (7t)
dy/dt = 7 cos (7t)
So, we can substitute these values into the formula and integrate over the given range of t:
L = ∫[0,π/14]√[(-7 sin (7t))^2 + (7 cos (7t))^2] dt
L = ∫[0,π/14]7 dt
L = 7t |[0,π/14]
L = 7(π/14 - 0)
L = π/2
Therefore, the arc length of the curve x = 7 cos ( 7 t ) , y = 7 sin ( 7 t ) with 0 ≤ t ≤ π 14 is π/2 units.

Read more about arc length.

https://brainly.com/question/31031267

#SPJ11

The selling price for the tickets is $209.

Here, we have

Given:

If the cost of tickets is 190 dollars, and the markup is 10 percent,

We have to find the selling price.

Markup refers to the amount that must be added to the cost price of a product or service in order to make a profit.

It is computed by multiplying the cost price by the markup percentage. To find out what the selling price would be, you just need to add the markup to the cost price.

The markup percentage is 10%.

10 percent of the cost of tickets ($190) is:

$190 x 10/100 = $19

Therefore, the markup is $19.

Now, add the markup to the cost of tickets to obtain the selling price:

Selling price = Cost price + Markup= $190 + $19= $209

Therefore, the selling price for the tickets is $209.

To learn about the selling price here:

https://brainly.com/question/31211894

#SPJ11

That w is in the range (0, 1), we can conclude that the peak time t_p = 0. Peak time t_p is equal to 0

(a) To write the transfer function relating the input u(t) and the output y(t), we can take the Laplace transform of the given differential equation. Using the Laplace transform property for derivatives, we have:

sY(s) + 2wnY(s) + wY(s) = wU(s)

Rearranging the equation, we get:

Y(s) (s + 2wn + w) = wU(s)

Dividing both sides by (s + 2wn + w), we obtain:

H(s) = Y(s)/U(s) = w / (s + 2wn + w)

Therefore, the transfer function relating the input u(t) and the output y(t) is H(s) = w / (s + 2wn + w).

(b) To find the unit step response of the system, we can substitute U(s) = 1/s into the transfer function H(s):

Y(s) = H(s)U(s) = (w / (s + 2wn + w)) * (1/s)

Taking the inverse Laplace transform of Y(s), we get:

y(t) = w(1 - e^(-2wn - w)t)

(c) To find the peak time t_p, we need to determine the time it takes for the unit step response y(t) to reach its first peak. The first peak occurs when dy(t)/dt = 0.

Differentiating y(t) with respect to t, we have:

dy(t)/dt = w(2wn + w)e^(-2wn - w)t

Setting dy(t)/dt = 0, we get:

w(2wn + w)e^(-2wn - w)t = 0

Since e^(-2wn - w)t is never equal to zero, we have:

2wn + w = 0

Simplifying the equation, we find:

wn = -w/2

Given that w is in the range (0, 1), we can conclude that the peak time t_p = 0.

Therefore, the peak time t_p is equal to 0

To know more about Peak time .

https://brainly.com/question/28081568

#SPJ11

The peak time t_p is 2ln(3) / w.

(a) The transfer function relating the input u and the output y is:

H(s) = Y(s) / U(s) = 1 / (s + 2ζwns + wn^2)

where s is the Laplace variable, ζ = 0.5, and wn is the natural frequency given by wn = w / sqrt(1 - ζ^2).

(b) The unit step response of the system is given by:

y(t) = (1 - e^(-ζwnt)) / (wnsqrt(1 - ζ^2)) - (e^(-ζwnt) / sqrt(1 - ζ^2))

(c) To find the peak time t_p, we need to find the time at which the first peak of the unit step response occurs. This peak occurs when the derivative of y(t) with respect to t is zero. Thus, we need to solve for t in the equation:

dy(t) / dt = ζwnsqrt(1 - ζ^2)e^(-ζwnt) - (1 - ζ^2)wnsqrt(1 - ζ^2)e^(-ζwnt) / (wnsqrt(1 - ζ^2))^2 = 0

Simplifying, we get:

e^(-ζwnt_p) = ζ / sqrt(1 - ζ^2)

Taking the natural logarithm of both sides and solving for t_p, we get:

t_p = -ln(ζ / sqrt(1 - ζ^2)) / (ζwn)

Substituting the given values of ζ and wn, we get:

t_p = -ln(1 / sqrt(3)) / (0.5w) = ln(3) / (0.5w) = 2ln(3) / w

Know more about transfer function here:

https://brainly.com/question/13002430

#SPJ11

The correct answer is: Standard Deviation = 4.03.

To calculate the standard deviation of a set of data, you can use the following steps:

Calculate the mean (average) of the data.

Subtract the mean from each data point and square the result.

Calculate the mean of the squared differences.

Take the square root of the mean from step 3 to get the standard deviation.

Let's apply these steps to the data you provided: 23, 19, 28, 30, 22.

Step 1: Calculate the mean

Mean = (23 + 19 + 28 + 30 + 22) / 5 = 122 / 5 = 24.4

Step 2: Subtract the mean and square the result for each data point:

(23 - 24.4)² = 1.96

(19 - 24.4)² = 29.16

(28 - 24.4)² = 13.44

(30 - 24.4)² = 31.36

(22 - 24.4)² = 5.76

Step 3: Calculate the mean of the squared differences:

Mean of squared differences = (1.96 + 29.16 + 13.44 + 31.36 + 5.76) / 5 = 81.68 / 5 = 16.336

Step 4: Take the square root of the mean from step 3 to get the standard deviation:

Standard Deviation = √(16.336) ≈ 4.03

Therefore, the correct answer is: Standard Deviation = 4.03.

To know more about standard deviation refer to

https://brainly.com/question/14930619

#SPJ11

The letter used to represent Pearson's product-moment correlation coefficient is "r".

This coefficient measures the strength and direction of the linear relationship between two variables. It ranges from -1 to 1, where 1 indicates a perfect positive correlation, -1 indicates a perfect negative correlation, and 0 indicates no linear correlation.

To calculate Pearson's correlation coefficient, we first standardize the variables by subtracting their means and dividing by their standard deviations. Then, we calculate the product of the standardized values for each pair of corresponding data points. The sum of these products is divided by the product of the standard deviations of the two variables. The resulting value is the correlation coefficient "r".

Learn more about  linear correlation : brainly.com/question/31735381

#SPJ11

The distance from the point S with coordinates (5, 10, 2) to the plane defined by the equation x + y + 10z - 3 = 0 is estimated to be around 2.77 units.

The distance between a point and a plane can be calculated using the formula:

d = |ax + by + cz + d| / √(a² + b² + c²)

where (a, b, c) is the normal vector to the plane, and (x, y, z) is any point on the plane.

The given plane can be written as:

x + y + 10z - 3 = 0

So, the coefficients of x, y, z, and the constant term are 1, 1, 10, and -3, respectively. The normal vector to the plane is therefore:

(a, b, c) = (1, 1, 10)

To find the distance between the point S(5, 10, 2) and the plane, we can substitute the coordinates of S into the formula for the distance:

d = |1(5) + 1(10) + 10(2) - 3| / √(1² + 1² + 10²)

Simplifying the expression, we get:

Therefore, the distance between the point S(5, 10, 2) and the plane x + y + 10z - 3 = 0 is approximately 2.77 units.

Learn more about normal vector

brainly.com/question/31435693

#SPJ11

Answer:

1) 80

2) 90

3) 120

4) 80

5) 50

6) 5

7) 35

8) 10

9) 90

10) 180

Step-by-step explanation:

:o

Answer:

1) 80

2) 90

3) 120

4) 80

5) 50

6) 5

7) 35

8) 10

9) 90

10) 180

Step-by-step explanation:

The formula for the exponential function passing through the points (-3, 3/25) and (1, 15) is:
f(x) = 15 * 5^x

To find a formula for the exponential function passing through the points (-3, 3/25) and (1, 15), we can start by using the general form of an exponential function, which is f(x) = ab^x, where a is the initial value and b is the growth factor. Using the two given points, we can form two equations:

3/25 = ab^(-3)
15 = ab

We can solve for a and b by first dividing the second equation by the first equation:

15 / (3/25) = ab / (ab^(-3))

Simplifying, we get:

125 = b^3

Taking the cube root of both sides, we get:

b = 5

Substituting this value into one of the original equations, we can solve for a:

3/25 = a(5)^(-3)
a = 3/25 * 125 = 15

To learn more about : exponential function

https://brainly.com/question/2456547

#SPJ11

There are 2 possible values for N.

To find the number of possible values for N, we must first find the common fraction representing people who value both color and smell. To do this, we need to find the LCM (Least Common Multiple) of the denominators 14 and 12. The LCM of 14 and 12 is 84.

Let x be the number of people who value both color and smell. Then, (9/14)N + (7/12)N - x = 753, which simplifies to (27/84)N + (14/84)N - x = 753. Combining the fractions gives (41/84)N - x = 753.

Now, we know that x is an integer, and (41/84)N must be an integer as well. Therefore, N must be a multiple of 84. Since 41 is a prime number, the only multiples of 84 that can satisfy this condition are 84 and 168, making 2 possible values for N.

To know more about Least Common Multiple click on below link:

https://brainly.com/question/26487478#

#SPJ11

Answer:

n

Step-by-step explanation:

The other state that joined the Union as a free state at the same time as Kansas was Minnesota.

Minnesota was admitted on May 11, 1858, and Kansas was admitted on January 29, 1861. Both states were admitted as free states as a result of the Compromise of 1850. The Compromise of 1850 was a series of laws that were passed in order to avoid a civil war over the issue of slavery.

The Compromise of 1850 included the admission of California as a free state, the admission of Utah and New Mexico as territories, and the Fugitive Slave Act. The Fugitive Slave Act required all citizens to return runaway slaves to their owners. The Fugitive Slave Act was very unpopular in the North, and it helped to fuel the abolitionist movement.

The admission of Minnesota and Kansas as free states upset the balance of power between the slave states and the free states. This led to increased tensions between the North and the South, and it eventually led to the Civil War.

Learn more about Union on

https://brainly.com/question/881501

#SPJ1

The probability that a customer does not win an appetizer is given as follows:

p = 0.8 = 80%.

A probability is calculated as the division of the desired number of outcomes by the total number of outcomes in the context of a problem/experiment.

The total number of marbles is given as follows:

1 + 4 + 7 + 3 = 15 marbles.

An appetizer is won with a green marble, and 3 of the marbles are green, while 12 are not, hence the probability that a customer does not win an appetizer is given as follows:

p = 12/15

p = 0.8 = 80%.

More can be learned about probability at https://brainly.com/question/24756209

#SPJ1

Answer:

100 feet

Step-by-step explanation:

The fence goes around the patio. It has to be 30ft across the top and bottom each. And 20ft up and down the left and right sides.

Perimeter (all the way around)

= 20+30+20+30

= 100

The fence will need to be 100ft long.

The region is bounded by the x-axis x=0, x=2pi*/3 and y= 3sin(x/2)   is pi/3.

To find the area of region r, we first need to sketch the region on the x-y plane. From the given information, we know that the region is bounded by the x-axis, the line x=0, the line x=2pi/3, and the curve y=3sin(x/2). To sketch the curve, we can start by noting that sin(x/2) is a periodic function with period 2pi. This means that the curve will repeat itself every 2pi units on the x-axis. We can also note that sin(x/2) is non-negative for x in the interval [0, 2pi], which means that the curve will lie above the x-axis in this interval. To sketch the curve in the interval [0, 2pi/3], we can use the fact that sin(x/2) is increasing on this interval. This means that the curve will start at the point (0,0) and increase until it reaches its maximum value of 3sin(pi/6) = 3/2 at x=pi/3. The curve will then decrease until it reaches the x-axis at x=2pi/3.
Using this information, we can sketch the region r as a triangle with base 2pi/3 and height 3/2. The area of this triangle is given by:
area = 1/2 * base * height = 1/2 * (2pi/3) * (3/2) = pi/3
Therefore, the area of region r is pi/3.

Learn more about periodic function here:

https://brainly.com/question/14325171

#SPJ11

The matrix of a relation R on the set {1, 2, 3, 4} can be used to determine if R is reflexive, symmetric, antisymmetric, and transitive.

To determine the properties of reflexivity, symmetry, antisymmetry, and transitivity of a relation R on a set, we can examine its matrix representation. The matrix of a relation R on a set with n elements is an n x n matrix, where the entry in the (i, j) position is 1 if the pair (i, j) is in the relation R, and 0 otherwise.

For reflexivity, we check if the diagonal entries of the matrix are all 1. If every element of the set is related to itself, then the relation R is reflexive.

For symmetry, we compare the matrix with its transpose. If the matrix and its transpose are identical, then the relation R is symmetric.

For antisymmetry, we examine the off-diagonal entries of the matrix. If there are no pairs (i, j) and (j, i) in the relation R with i ≠ j, or if such pairs exist but only one of them is present, then the relation R is antisymmetric.

For transitivity, we check the matrix for any instances where the entry (i, j) and (j, k) are both 1, and if the entry (i, k) is also 1. If such instances hold for all pairs (i, j) and (j, k), then the relation R is transitive.

By analyzing the matrix of a relation R on the set {1, 2, 3, 4} using these criteria, we can determine if the relation R is reflexive, symmetric, antisymmetric, and transitive

Learn more about matrix here:

https://brainly.com/question/28180105

#SPJ11

Thus, m∠F =  33º for the corresponding angle measures for each similar triangle ΔABC and ΔDEF.

To start, we know that similar triangles have corresponding angles that are congruent. Therefore, we can set up the following proportion:

m∠BAC/m∠EDF = m∠BCA/m∠DFE

Substituting the given angle measures, we get:
(x² - 5x)/(4x + 36) = (4x - 5)/m∠F

To solve for m∠F, we need to isolate it on one side of the equation. First, we can cross-multiply to get:
(4x - 5)(4x + 36) = (x² - 5x)m∠F

Expanding the left side, we get:
16x² + 116x - 180 = (x² - 5x)m∠F

Next, we can divide both sides by (x² - 5x):
(16x² + 116x - 180)/(x² - 5x) = m∠F

Simplifying the left side, we get:
(4x + 29)/(x - 5) = m∠F

Therefore, m∠F = (4x + 29)/(x - 5).

To check our answer, we can plug in a value for x and find the corresponding angle measures for each triangle. For example, if x = 6:

m∠BAC = (6² - 5(6))º = 16º
m∠BCA = (4(6) - 5)º = 19º
m∠EDF = (4(6) + 36)º = 60º

Using our formula for m∠F, we get:
m∠F = (4(6) + 29)/(6 - 5) = 33º

We can see that this satisfies the proportion and therefore our answer is correct.

Know more about the similar triangle

https://brainly.com/question/14285697

#SPJ11

To find the expected value of the random variable exp(X), we need to calculate the integral of exp(x) multiplied by the probability density function (PDF) of X, and then evaluate it over the appropriate range.

Given that X is an exponential random variable with PDF fX(x) = 2 exp(-2x) for x ≥ 0, we want to find E[exp(X)], which is the expected value of exp(X).

The expected value of a continuous random variable can be computed using the following formula:

E[g(X)] = ∫ g(x) * fX(x) dx

In our case, we want to find E[exp(X)], so we need to compute the following integral:

E[exp(X)] = ∫ exp(x) * 2 exp(-2x) dx

Simplifying the expression:

E[exp(X)] = 2 ∫ exp(-x) dx

Now, we can integrate the expression:

E[exp(X)] = -2 exp(-x) + C

To evaluate the integral, we need to determine the limits of integration. Since X is an exponential random variable defined for x ≥ 0, the limits of integration will be from 0 to infinity.

E[exp(X)] = -2 exp(-x) |_0^∞

E[exp(X)] = -2 [exp(-∞) - exp(0)]

Since exp(-∞) approaches 0, and exp(0) = 1, we can simplify further:

E[exp(X)] = -2 [0 - 1] = 2

Therefore, the expected value of the random variable exp(X) is 2.

Learn more about exponential here: brainly.com/question/32388470

#SPJ11

Answer: Therefore, the correlation coefficient, r, is 0.877. This indicates a strong positive correlation between age and fundamental frequency in hyena giggles.

Step-by-step explanation:

To calculate the correlation coefficient, r, we need to follow these steps:

Step 1: Calculate the sum of squares of age.

Step 2: Calculate the sum of squares for fundamental frequency.

Step 3: Calculate the sum of products between age and frequency.

Step 4: Compute the correlation coefficient, r.

Here are the calculations:

Step 1: Calculate the sum of squares of age.

2^2 + 2^2 + 2^2 + 6^2 + 9^2 + 10^2 + 13^2 + 10^2 + 14^2 + 14^2 + 12^2 + 7^2 + 11^2 + 11^2 + 14^2 + 20^2 = 1066

Step 2: Calculate the sum of squares for fundamental frequency.

840^2 + 670^2 + 580^2 + 470^2 + 540^2 + 660^2 + 510^2 + 520^2 + 500^2 + 480^2 + 400^2 + 650^2 + 460^2 + 500^2 + 580^2 + 500^2 = 1990600

Step 3: Calculate the sum of products between age and frequency.

2840 + 2670 + 2580 + 6470 + 9540 + 10660 + 13510 + 10520 + 14500 + 14480 + 12400 + 7650 + 11460 + 11500 + 14580 + 20500 = 190080

Step 4: Compute the correlation coefficient, r.

r = [nΣ(xy) - ΣxΣy] / [sqrt(nΣ(x^2) - (Σx)^2) * sqrt(nΣ(y^2) - (Σy)^2))]

where n is the number of observations, Σ is the sum, x is the age, y is the fundamental frequency, and xy is the product of x and y.

Using the values we calculated in steps 1-3, we get:

r = [16190080 - (106500)] / [sqrt(162066 - 106^2) * sqrt(161990600 - 500^2)]

= 0.877

Therefore, the correlation coefficient, r, is 0.877. This indicates a strong positive correlation between age and fundamental frequency in hyena giggles.

To Know more about correlation refer here

https://brainly.com/question/31588111#

#SPJ11

The equivalent expression of the rational exponent ∛a² is [tex](a)^{\frac{2}{3}[/tex].

Rational exponents are exponents that are fractions, where the numerator is a power and the denominator is a root.

So rational exponents (fractional exponents) are exponents that are fractions or rational expressions.

To determine the rational exponent equivalent to the expression given, we will apply the power rule of indices as shown below.

The given expression is ;

∛a²

The rational exponent is calculated as follows;

∛a² = [tex](a)^{\frac{2}{3}[/tex]

Thus, based on exponent power rule, the given expression is equivalent to ∛a² = [tex](a)^{\frac{2}{3}[/tex]

Learn more about rational exponents here: brainly.com/question/30603002

#SPJ1

The complete question is below:

Find the equivalent expression of the rational exponent ∛a². does anyone know it

The vector function r(t) is [tex]r(t) = (1/7) t^7 i + e^t j + (1/3) e^{(3t)} k[/tex]

We can start by integrating the given derivative function to obtain the vector function r(t):

[tex]r'(t) = t^6 i + e^t j + 3t e^{(3t)} k[/tex]

Integrating the first component with respect to t gives:

[tex]r_1(t) = (1/7) t^7 + C_1[/tex]

Integrating the second component with respect to t gives:

[tex]r_2(t) = e^t + C_2[/tex]

Integrating the third component with respect to t gives:

[tex]r_3(t) = (1/3) e^{(3t)} + C_3[/tex]

where [tex]C_1, C_2,[/tex] and[tex]C_3[/tex] are constants of integration.

Using the initial condition r(0) = i j k, we can solve for the constants of integration:

[tex]r_1(0) = C_1 = 0r_2(0) = C_2 = 1r_3(0) = C_3 = 1/3[/tex]

Therefore, the vector function r(t) is:

[tex]r(t) = (1/7) t^7 i + e^t j + (1/3) e^{(3t)} k[/tex]

Learn more about vector function

brainly.com/question/3147371

#SPJ11

The joint density function of the random variables X and Y is given by f(x, y) = (2e^(-2x))/x for 0 ≤ x < ∞ and 0 ≤ y ≤ x, and 0 otherwise. (a) The covariance of X and Y can be computed using the definition of covariance.

(a) The covariance of X and Y, Cov(X, Y), can be computed using the formula Cov(X, Y) = E(XY) - E(X)E(Y). We need to calculate the expectations E(XY), E(X), and E(Y) to find the covariance.

(b) To find E(Y|X), we need to calculate the conditional expectation of Y given X. This can be done by integrating Y multiplied by the conditional probability density function f(y|x) with respect to y, where f(y|x) is obtained by dividing f(x, y) by the marginal density function of X, fX(x).

(c) To compute Cov(X, E(Y|X)), we first find E(Y|X) using the method described in (b). Then we calculate the covariance between X and E(Y|X) using the definition of covariance. It can be shown that Cov(X, E(Y|X)) is the same as Cov(X, Y).

Therefore, by following the steps outlined above, we can compute the covariance of X and Y, find the conditional expectation E(Y|X), and verify that the covariance of X and E(Y|X) is the same as the covariance of X and Y

Learn more about covariance here:

https://brainly.com/question/28135424

#SPJ11

The inverse function of f(x) = 7tan(9x) is f⁻¹(x) = (1/9)arctan(x/7).

To find the inverse function of f(x) = 7tan(9x), we first need to understand the concept of inverse functions. An inverse function reverses the operation of the original function, meaning that if f(x) takes an input x and produces an output y, then the inverse function, denoted as f⁻¹(x), takes an input y and produces an output x.

Follow these steps to find the inverse function of f(x) = 7tan(9x):

1. Replace f(x) with y: y = 7tan(9x).
2. Swap x and y: x = 7tan(9y).
3. Solve for y: First, divide both sides by 7 to isolate the tangent function: x/7 = tan(9y).
4. Apply the arctangent (inverse tangent) function to both sides: arctan(x/7) = 9y.
5. Divide by 9 to solve for y: (1/9)arctan(x/7) = y.

Thus, the inverse function of f(x) = 7tan(9x) is f⁻¹(x) = (1/9)arctan(x/7). This inverse function takes an input x and returns the value of y such that the original function f(x) would map that y back to the input x. In other words, if f(x) = 7tan(9x) transforms a value x to a value y, then f⁻¹(x) = (1/9)arctan(x/7) will transform that same value y back to the original value x.

To know more about function, refer to the link below:

https://brainly.com/question/2541698#

#SPJ11

Answer:B

Step-by-step explanation: had the question before