Mathematics College

I gave extra points and I will give brainliest
Which of these is an example of a random sample?

A. Mrs. Baker selects the 10 students who raised their hands to volunteer to fill out a survey.

B. Mrs. Baker selects the 10 students whose names are drawn from a bag to fill out a survey.

C. Mrs. Baker selects the 10 students who arrived to class first on Monday to fill out a survey.

D. Mrs. Baker selects the 10 students with the highest grade point averages to fill out a survey.

Answers

Answer 1

Answer:

Step-by-step explanation:

There is no bias involved and there is a chance for everyone to do it.

Answer 2

Answer:

Step-by-step explanation:

Mrs. Baker selects the 10 students with the highest grade point averages to fill out a survey.

Related Questions

A recipe uses 3 tbspoons of olive oil for every 2 cloves of garlic. How many cloves for every 1 tbspoons of oil?

Answers

Answer:

half a clove of garlic

Step-by-step explanation:

2 tablespoons of olive oil would mean 1 clove of garlic so 1 tablespoon of olive oil would mean half a clove of garlic

Answer:

Step-by-step explanation:

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Todd has been helping his grandmother vanilla ice cream. Yesterday morning they made 4.5 quarts of ice cream. They are going to store the ice
cream in pint sized containers to place in the freezer.
Calculate how many pint-sized containers Todd needs to store 4.5 quarts of ice cream.
Todd will need
pint-sized containers to store 4.5 quarts of ice cream

Answers

Answer:

Todd will need 9 pint-sized containers to store 4.5 quarts of ice cream.

The Customer Service Center in a large New York department store has determined that the amount of time spent with a customer about a complaint is normally distributed, with a mean of 10.1 minutes and a standard deviation of 2.8 minutes. What is the probability that for a randomly chosen customer with a complaint, the amount of time spent resolving the complaint will be as follows. (Round your answers to four decimal places.)(a) less than 10 minutes (b) longer than 5 minutes (c) between 8 and 15 minutes

Answers

Answer:

0.6395 ; 0.9657 ; 0.7333

Step-by-step explanation:

Given that:

Mean (m) = 10.1

Standard deviation (s) = 2.8

Obtain the following probabilities :

a) less than 10 minutes

P(x < 10)

Z = (x - m) / s

Z = (10 - 10.1) / 2.8

Z = 0.1 / 2.8

Z = 0.0357142

P(Z < 0.357) = 0.6395 ( Z probability calculator)

(b) longer than 5 minutes

P(x > 5)

Z = (x - m) / s

Z = (5 - 10.1) / 2.8

Z = −1.821428

P(Z < - 1.821) = 0.9657 ( Z probability calculator)

P(8 < x < 15)

P(x < 8)

Z = (x - m) / s

Z = (8 - 10.1) / 2.8

Z = − 0.75

P(Z < - 0.75) = 0.22663 ( Z probability calculator)

P(x < 15)

Z = (x - m) / s

Z = (15 - 10.1) / 2.8

Z = 1.75

P(Z < 1.75) = 0.95994 ( Z probability calculator)

P(Z < 1.75) - P(Z < - 0.75)

0.95994 - 0.22663 = 0.7333

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