Introduction to Random Variables

Question 1

The grade distribution for students in the introductory statistics class at a local community college are displayed in the table. In this table, A = 4, B = 3, etc. Let X represent the grade for a randomly selected student.

Revolt · Accepted Answer

B: 0.31

Question 2

The owner of a local movie theater keeps track of the number of tickets sold in each purchase. The owner determines the probabilities based on these records. Let X represent the number of tickets bought in one purchase. The distribution for X is displayed in the histogram.

Revolt · Accepted Answer

B: skewed right

Question 3

The owner of a local movie theater keeps track of the number of tickets sold in each purchase. The owner determines the probabilities 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

A: P(X ≤ 3)

Question 4

The grade distribution for students in the introductory statistics class at a local community college are displayed in the table. In this table, A = 4, B = 3, etc. Let X represent the grade for a randomly selected student.

Revolt · Accepted Answer

D: 0.91

Question 5

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

D: The probability of a randomly selected test having a score higher than 4 is 0.15.

Question 6

Hannah has a chicken coop with six hens. Let X represent the total number of eggs the hens lay on a random day. The distribution for X is given in the table.

Revolt · Accepted Answer

B: 0.07

Question 7

The owner of a local movie theater keeps track of the number of tickets sold in each purchase. The owner determines the probabilities 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

A: 0.17

Question 8

The grade distribution for students in the introductory statistics class at a local community college are displayed in the table. In this table, A = 4, B = 3, etc. Let X represent the grade for a randomly selected student.

Revolt · Accepted Answer

C: P(X > 2)

Question 9

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: 0.62

Question 10

The owner of a local movie theater keeps track of the number of tickets sold in each purchase. The owner determines the probabilities 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

D: 0.83

Introduction to Random Variables Answers

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