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When an opinion poll calls landline telephone numbers at random, approximately 35% of the numbers are...

When an opinion poll calls landline telephone numbers at random, approximately 35% of the numbers are working residential phone numbers. The remainder are either non-residential, non-working, or computer/fax numbers. You watch the random dialing machine make 15 calls. (Round your answers to four decimal places.)

(a) What is the probability that exactly 3 calls reach working residential numbers?


(b) What is the probability that at most 3 calls reach working residential numbers?


(c) What is the probability that at least 3 calls reach working residential numbers?


(d) What is the probability that fewer than 3 calls reach working residential numbers?


(e) What is the probability that more than 3 calls reach working residential numbers?

Math   Statistics-And-Probability   
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