Answers
ans.................
Related Questions
A bag has 4 red marbles, 5 blue marbles, and 6 green marbles. What is the probability if choosing a red marble from the bag, not putting it back, and then choosing a green marble?
4/15
6/14
12/105
24/225
Answers
Step-by-step explanation:
hope u get it...
mark brainlist!!!
An ecologist is examining whether the number of fish caught in a large river basin has changed since a fire burned some of the surrounding forested area and vegetation along the river. Data in the form of fishing reports was available for a five-year period before the fire. From a random sample of 195 fishing reports before the fire, the mean catch was 6.3 fish with a standard deviation of 1.6. In a random sample of 143 reports three years after the fire, the mean catch was 7.1 fish with a standard deviation of 2.1.
Required:
What represents the standard error of the difference in the mean number of fish caught before and after the fire?
Answers
Answer:
The standard error of the difference in the mean number of fish caught before and after the fire is 0.2153.
Step-by-step explanation:
Subtraction of normal variables:
When we subtract two normal variables, the standard deviation is the square root of the sum of variances of each variable.
Central Limit Theorem
The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean [tex]\mu[/tex] and standard deviation [tex]s = \frac{\sigma}{\sqrt{n}}[/tex].
For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.
Sample of 195 fishing reports before the fire, the mean catch was 6.3 fish with a standard deviation of 1.6.
The standard error for this sample is:
[tex]s_b = \frac{1.6}{\sqrt{195}} = 0.1246[/tex]
Sample of 143 reports three years after the fire, the mean catch was 7.1 fish with a standard deviation of 2.1.
The standard deviation for this sample is:
[tex]s_a = \frac{2.1}{\sqrt{143}} = 0.1756[/tex]
What represents the standard error of the difference in the mean number of fish caught before and after the fire?
[tex]s = \sqrt{s_a^2 + s_b^2} = \sqrt{0.1756^2 + 0.1246^2} = 0.2153[/tex]
The standard error of the difference in the mean number of fish caught before and after the fire is 0.2153.
Answer:
sqrt [ (1.6^2)/195 + (2.1^2)/143 ]
divide the 240g into the ratio 5:3:4?
Answers
5x+ 3x +4x =12x
12x =240
X=20
100:60:80
Which expression has a value of 7 when x=-2?
A:|3x+5|-4
B:|-3x-3|+10
C:|-4x+6|-7
D:|4x-8|-5
Answers
Answer:
DONT PRESS THAT LINK
Step-by-step explanation:
What are the zeros of the polynomial function f(x) = x3 + 9x2
Answers
Hi there!
[tex]\large\boxed{x = -9, 0}[/tex]
Find the zeros using factoring:
f(x) = x³ + 9x²
Factor out the common term, or x²:
f(x) = x²(x + 9)
Set each factor equal to 0:
x² = 0
x = 0
x + 9 = 0
x = -9
The zeroes are -9, 0.
Saundra can write 5 thank-you notes in 15 minutes. She wants to know how many notes she can write in 2 hours if she continues
writing at the same rate.
Mike says that Saundira could write 60 notes in 2 hours.
Is Mike correct? Explain your answer using the drop-down menus.
Mike is not
correct
. Since 15 minutes is of an hour, Saundira is writing at a rate of Choose... notes per hour. That
means Saundra could write 120
notes in 2 hours.
Answers
The width of a rectangle is represented by 5 - 2y.
The length is twice as long as the width What is the
perimeter of the rectangle? Select all correct expressions
A45-27
3 65 - 27
C20 -
D30 - 12
Answers
Answer:
Perimeter of rectangle = 30 - 12y
Step-by-step explanation:
Given:
Width of rectangle = 5 - 2y
Length of rectangle = 2(width) = 2[5 - 2y] = 10 - 4y
Find:
Perimeter of rectangle
Computation:
Perimeter of rectangle = 2[l + b]
Perimeter of rectangle = 2 [10 - 4y + 5 - 2y]
Perimeter of rectangle = 2[15 - 6y]
Perimeter of rectangle = 30 - 12y
estimate each percent: 50% of 39
Answers
Answer:
19.5
Step-by-step explanation:
39 x 0.50 = 19.5
Write a polynomial that represents the area of the large rectangle with side lengths of x+4 and x+3
Answers
Answer:
Step-by-step explanation:
First off use algebra tiles, Didax has a good one. So basically x*x is x^2 right? and 4*3 is 12 right? also 4x+3x=7x. So the answer is x^2+7x+12! :)
Find f(-3) when f(x) = -x + 1
Answers
Answer:
4
Step-by-step explanation:
so when it says f(x)=-x+1
the x values are constant so what value is in f(x) the value of x goes right into -x+1
f(-3)=-x+1
f(-3)=-(-3)+1
f(-3)=4
Answer:
yea the anwser is 4
（>﹏<）
The vertices of APQR are P(-3, 8) Q(-6,-4), and R(1, 1). If you reflect APQR across the x-axis, what will be the coordinates of the vertices of the image AP'Q'R'?
Answers
Answer:(-3,-8),(-6,4),(1,-1)
Step-by-step explanation:
Given
Vertices of the triangle are
[tex]P(-3,8), Q(-6,-4),R(1,1)[/tex]
Coordinates (a,b) when reflected about x-axis is given as (a,-b) i.e. Y coordinate changes its sign
[tex]\therefore P\rightarrow P'(-3,-8)\\\Rightarrow Q\rightarrow Q'(-6,4)\\\Rightarrow R\rightarrow R'(1,-1)[/tex]
The graph of g(x) = log(4x) has -
A two x-intercepts and no y-intercept
B one x-intercept and one y-intercept
C no x-intercept or no-y-intercept
D one x-intercept and no y-intercept
Answers
is 3/10 bigger than 2/9
Answers
Answer:
2
9
is smaller than
3
10
Step-by-step explanation:
LOOK AT THE PICTURE!!
Answers
Answer:
it is data
Step-by-step explanation:
just look at it and describe its properties
Bye,
Canus Lupus
Did I get this first question right?
Answers
Answer:
no
Step-by-step explanation:
the correct answer is 56.55 inches
Step-by-step explanation:
nope. radius = 1/2D so it's 9.
2. r= 14.5
3. d= 42
4. d = 26
what is an outlier number?
Answers
Answer:
an outlier is a number that is at least 2 standard deviations away from the mean for example in the set 1,1,1,1,1,1,1,1,1,7,7,7 would be the outlier
Step-by-step explanation:
watashi wa sore ga tadashī koto o negatte imasu
arigatozaimasu!!
Step-by-step explanation:
i have noooo idea but ayyeee
PLS HELP I WILL GIVE YOU BRAINLIEST AND LOVE YOU FOREVER
Jessica ran 2 3/4 miles on Tuesday, 3 1/4 on Wednesday, and 1 1/4 on Thursday. She ran the same number of miles as the previous three days on Friday through Sunday. How many miles is Jessica run Tuesday through Sunday? Leave your answer as a mixed fraction.
Answers
What is the solution to the equation below?
0.5x + 20 = 0.6x
A. x = -200
B. x=2
C.x = 20
D.x = 200
Answers
Answer:
it's D 200 for sure my answer I correct
write the equation of the given line in slope intercept form (2,3) (8,6)
Answers
Answer:
y = 1/2x + 2
Step-by-step explanation:
slope:
6 - 3 / 8 - 2 = 3 / 6 = 1/2
start by putting it in point slope form and then simplify it to slope intercept form:
y - 3 = 1/2(x - 2)
y - 3 = 1/2x - 1
y = 1/2x + 2
A quality-conscious disk manufacturer wishes to know the fraction of disks his company makes which are defective. Step 1 of 2: Suppose a sample of 2346 floppy disks is drawn. Of these disks, 1971 were not defective. Using the data, estimate the proportion of disks which are defective. Enter your answer as a fraction or a decimal number rounded to three decimal places.
Answers
Answer:
The proportion of disks which are defective is 0.16.
Step-by-step explanation:
The proportion of defective disks is the number of defective disks in the sample divided by the size of the sample.
In this question:
2346 disks.
1971 not defective, so 2346 - 1971 = 375 defective.
[tex]p = \frac{375}{2346} = 0.16[/tex]
The proportion of disks which are defective is 0.16.
What is radiant energy from the sun called
Answers
Answer:
Solar rays
Step-by-step explanation:
Either that or uv rays
Answer:
Electromagnetic Radiation
Step-by-step explanation:
Identify the vertex and the y-intercept of the graph translated 1 unit right from the parent function f(x)=x2
Vertex ( ?,?)
y-intercept: ?
Answers
Answer:
Step-by-step explanation:
y = (x-1)²
vertex (1,0)
y-intercept = (0-1)² = 1
calculate the actual sales since the sales tax were rung up together. assume sales tax of 6% and total sales of $27,000. What is the actual sales? ( round your answer to the nearest cent.)
Answers
Answer:
$25471.7
Step-by-step explanation:
1.06*25471.7=27000.002
Hope this helps
Select all of the terms that apply to the shape.
A) pentagon
B) hexagon
C) heptagon
D) octagon
E) nonagon
F) decagon
G) regular polygon
H) irregular polygon
I) m concave
J) m convex
Answers
G) regular polygon
I) concave
Intercontinental, Inc., uses a perpetual inventory system. Consider the following information about its inventory: July 1, purchased 10 units for $910 or $91 per unit; July 3, purchased 15 units for $1,590 or $106 per unit; July 14, sold 20 units; July 17, purchased 20 units for $2,300 or $115 per unit; July 28, purchased 10 units for $1,190 or $119 per unit; July 31, sold 23 units.
Using weighted average, the cost of goods sold for the sale of 23 units on July 31 is ____ and the inventory balance at July 31 is _____.
Answers
Answer:
Using weighted average, the cost of goods sold for the sale of 23 units on July 31 is $2,504.70, and the inventory balance at July 31 is $ 1,306.90.
Step-by-step explanation:
Since Intercontinental, Inc., uses a perpetual inventory system, and on July 1, purchased 10 units for $ 910 or $ 91 per unit; on July 3, purchased 15 units for $ 1,590 or $ 106 per unit; on July 14, it sold 20 units; on July 17, purchased 20 units for $ 2,300 or $ 115 per unit; on July 28, purchased 10 units for $ 1,190 or $ 119 per unit; and on July 31, sold 23 units, to determine the average costs and the inventory balance as of July 31, the following calculations must be performed:
(910 +1590 + 2300 + 1190) / (10 + 15 + 20 + 10) = X
5990/55 = X
108.90 = X
108.90 x 23 = 2504.7
(55 x 108.9) - (43 x 108.9) = X
5990 - 4683.10 = X
1306.90 = X
Using weighted average, the cost of goods sold for the sale of 23 units on July 31 is $ 2504.70, and the inventory balance at July 31 is $ 1,306.90.
This month Joe spent 1/2 of his salary on food and 1/3 on rent. What part of his salary did he spend? Simplify the fraction if possible.
Answers
Answer:
the answer is 5/6
Step-by-step explanation:
1/2 + 1/3
1 =3 + 2=1 5
x
-- + --- = ---
2 x 3 = 6
It’s me again guys!! Can anyone help me please?
Answers
=(-4)^2 - [-4]
=(16) + 4
=20
(two negatives=positive)
Describe how the graph of the parent function y = StartRoot x EndRoot is transformed when graphing y = negative 3 StartRoot x minus 6 EndRoot
The graph is translated 6 units
Answers
Answer: is b- right
Step-by-step explanation:
We want to see how the graph of the parent function compares to the graph of the transformed function.
The transformed function is a reflection across the x-axis, followed by a translation of 6 units to the right, followed by a vertical dilation of scale factor 3 of the parent function.
The parent function is y = √x
The transformed function is y = -3*√(x - 6)
So there are 3 transformations applied to the parent function, let's describe these generally.
Reflection across the x-axis:
For a function f(x), a reflection across the x-axis just changes the sign:
g(x) = -f(x).
Horizontal shift:
For a function f(x), a horizontal shift of N units is written as:
g(x) = f(x + N)
if N is positive, the shift if to the left.if N is negative, the shift is to the right.Vertical dilation:
For a function f(x), a vertical dilation of scale factor K is written as:
g(x) = K*f(x)
Then from the parent function to the transformed function, we have:
A reflection across the x-axis, followed by a translation of 6 units to the right, followed by a vertical dilation of scale factor 3.
If you want to learn more, you can read:
https://brainly.com/question/19046248
Find the absolute maximum and absolute minimum values of f on the given interval. f(x) = 3x^4 − 4x^3 − 12x^2 + 1, [−2, 3]
Answers
Find the stationary points.
f(x) = 3x ⁴ - 4x ³ - 12x ² + 1
f '(x) = 12x ³ - 12 x ² - 24x
Solve f '(x) = 0.
12x ³ - 12 x ² - 24x = 12x (x ² + x - 2) = 12x (x - 1) (x + 2) = 0
→ x = 0, x = 1, x = -2
Check the value of f at the stationary points.
f (0) = 1
f (1) = -12
f (-2) = 33
Check the value of f at the boundary of the domain.
f (3) = 28
(We've already checked f (-2).)
Then over [-2, 3], we have max(f ) = 33 and min(f ) = -12.
If you place a 37-foot ladder against the top of a 12-foot building, how many feet will the bottom of the ladder be from the bottom of the building?
Answers
The building will be making 90° with the ground/horizontal.
Then we can apply Pythagoras theorem.
(Base)² + (Height)² = (Hypotenuse)²
=> x² + (12 foot)² = (37 foot)²
=> x² = (37 foot)² - (12 foot)²
We can expand LHS using a² - b² = (a + b)(a - b)
=> x² = (37 + 12 foot)(37 - 12 foot)
=> x² = 49 * 25 foot²
=> x² = (7 * 5)² foot²
=> x = 7 * 5 foot
=> x = 35 foot.