7.47 Twenty-five percent of the customers of a grocery store use an express checkout. Consider five randomly

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7.47 Twenty-five percent of the customers of a grocery store use an express checkout. Consider five randomly selected customers, and let x denote the number among the five who use the express checkout.

a. What is p(2), that is, P(x  2)?

b. What is P(x  1)?

c. What is P(2  x)? (Hint: Make use of your answer from Part (b).)

d. What is P(x  2)?

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Introduction To Statistics And Data Analysis

ISBN: 9780840054906

4th Edition

Authors: Roxy Peck, Chris Olsen, Jay L. Devore

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