A shoe store’s records show that 30% of the customers purchase by credit card. This morning 20 customers purchased shoes from the store. a. Find the probability that at least 12 of the customers used a credit card. b. What is the probability that at least 3 customers but not more than 6 used a credit card? c. What is the expected number of customers using a credit card?

A shoe store’s records show that 30% of the customers purchase by credit card. This morning 20 customers purchased shoes from the store. a. Find the probability that at least 12 of the customers used a credit card. b. What is the probability that at least 3 customers but not more than 6 used a credit card? c. What is the expected number of customers using a credit card?

Algebra and Trigonometry (MindTap Course List)

4th Edition

ISBN:9781305071742

Author:James Stewart, Lothar Redlin, Saleem Watson

Publisher:James Stewart, Lothar Redlin, Saleem Watson

Chapter14: Counting And Probability

Section14.3: Binomial Probability

Problem 26E

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