A salesperson estimates that 30% of people make a purchase. What is the probability that at least 3 of the first 5 people make a purchase?

Question

A salesperson estimates that 30% of people make a purchase.  What is the probability that at least 3 of the first 5 people make a purchase?

Patrick B. · Accepted Answer

(0.3)^3(0.7)^2  +  (0.3)^4(0.7) + (0.3)^5 = 0.02133 or just over 2%

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