Find the probability that exactly three calls reach a person


When a survey calls residential telephone numbers at random, only 28% of the calls reach a live person. You watch the random dialing machine make 17 calls.

(a) What is the probability that exactly 3 calls reach a person?

(b) What is the probability that 3 or fewer calls reach a person?

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Basic Statistics: Find the probability that exactly three calls reach a person
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