Question

1. The probability of telesales representative making a sale on a customer call is 0.15.

Find the probability that
(a) no sales are made in 10 calls
B)more than 1 sales are made in 20calls

Answer 1

(A.) 0.19687 (B.) 0.82444

Explanation:

a.

P(N=0) = 10C0(0.15)0(0.85)10 = 0.19687

b.

P(N > 1) = 1 - P(N=0) - P(N=1)

P(N=0) = 20C0(0.15)0(0.85)20 = 0.03876

P(N=1) = 20C1(0.15)1(0.85)19 = 0.1368

P(N > 1) = 1 - 0.03876 - 0.1368 = 0.82444