From Actuarial Math A telemarketer of an insurance company makes repeated calls to persons on a computer generated list. The probability of making a sale on any individual call is p= 0.1. Successive calls are independent. Let N be the number of unsuccessful calls before the first sale. What is the probability of making exactly 5 unsuccessful calls before (a) the third sale is made? (b) Find E(N) and Var(N) using E(N) = rß and Var(N) = rß(1+ B). %3D

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