Random digit dialing. When an opinion poll calls residential telephonenumbers at random
Chapter 0, Problem 13.6(choose chapter or problem)
Random digit dialing. When an opinion poll calls residential telephonenumbers at random, only 20% of the calls reach a live person. You watch therandom dialing machine make 15 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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