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4.1 Exercise 2

Avg difficulty 2.5

Suppose Nancy has classes three days a week. She attends classes three days a week 80% of the time, two days 15% of the time, one day 4% of the time, and no days 1% of the time. Suppose one week is randomly selected.

a. Let X = the number of days Nancy ____________________.

b. X takes on what values?

c. Suppose one week is randomly chosen. Construct a probability distribution table (called a PDF table) like the one in the example. The table should have two columns labeled x and P(x). What does the P(x) column sum to?

OpenStax Introductory Statistics 2e, 4.1 Probability Distribution Function (PDF) for a Discrete Random Variable, exercise 2

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Adapted from Introductory Statistics 2e © 2023 Rice University. Licensed under CC BY 4.0. Source: Introductory Statistics 2e. Imported at revision 50ec917.