Discrete Random Variables – Mean

Question 1

The owner of a local movie theater keeps track of the number of tickets sold in each purchase and makes a probability distribution based on these records. Let X represent the number of tickets bought in one purchase. The distribution for X is given in the table.

Revolt · Accepted Answer

B: 0.95

Question 2

Hannah has a chicken coop with 6 hens. Let X be the total number of eggs the hens lay on a randomly chosen day. The distribution for X is given in the table.

Revolt · Accepted Answer

A: 1.39

Question 3

A professional basketball player typically attempts 8 free throws per game. Let X represent the number of free throws made out of 8. The distribution for X is shown in the table.What is the standard deviation of the distribution?

Revolt · Accepted Answer

B: 1.40

Question 4

Hannah has a chicken coop with 6 hens. Let X represent the total number of eggs the hens lay on a randomly chosen day. The distribution for X is given in the table.What is the mean of the distribution?

Revolt · Accepted Answer

D: 4.2

Question 5

The final exam grade distribution for all students in the introductory statistics class at a local community college is displayed in the table, with A = 4, B = 3, C = 2, D = 1, and F = 0. Let X represent the grade for a randomly selected student from the class.

Revolt · Accepted Answer

B: The grade for a randomly selected student would typically vary from the expected grade by 1.08.

Question 6

The final exam grade distribution for all students in the introductory statistics class at a local community college is displayed in the table, with A = 4, B = 3, C = 2, D = 1, and F = 0. Let X represent the grade for a randomly selected student from the class.

Revolt · Accepted Answer

B: 3

Question 7

Hannah has a chicken coop with 6 hens. Let X represent the total number of eggs the hens lay on a randomly chosen day. The distribution for X is given in the table.Which is the correct interpretation of the standard deviation?

Revolt · Accepted Answer

C: The number of eggs laid on a randomly selected day would typically vary from the expected number of eggs by 1.4 eggs.

Question 8

Standardized tests for certain subjects, given to high school students, are scored on a scale of 1 to 5. Let X represent the score on a randomly selected exam. The distribution of scores for one subject’s standardized test is given in the table.

Revolt · Accepted Answer

B: 2.95

Question 9

The final exam grade distribution for all students in the introductory statistics class at a local community college is displayed in the table, with A = 4, B = 3, C = 2, D = 1, and F = 0. Let X represent the grade for a randomly selected student from the class.

Revolt · Accepted Answer

C: 2.98

Question 10

Standardized tests for certain subjects, given to high school students, are scored on a scale of 1 to 5. Let X represent the score on a randomly selected exam. The distribution of scores for one subject’s standardized test is given in the table.

Revolt · Accepted Answer

C: 3

Discrete Random Variables – Mean Answers

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Discrete Random Variables – Mean Answers

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