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

Question:

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 5 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 Þ 2)?

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