(Answered) Question an appliance store sells 20 refrigerators each

Statistics

Question: An appliance store sells 20 refrigerators each week. Ten percent of all purchasers of a refrigerator buy an extended warranty. Let X denote the number of the next 20 purchasers who do so.

a. Verify that X satisfies the conditions for a binomial random variable, and find n and p.

b. Find the probability that X is zero.

c. Find the probability that X is two, three, or four.

d. Find the probability that X is at least five.

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