National Infomercial Marketing Association determined the number of times buyers

Question

National Infomercial Marketing Association determined the number of times buyers of a product watched a TV infomercial before purchasing the product. The results are shown below. What is the probability that a buyer selected at random has watched a TV infomercial at least twice before purchasing the product? Write the answer in percent. __________________ What is the probability that a buyer selected at random has watched a TV infomercial once or twice before purchasing the product? Write the answer in percent. ______________ What is the probability that a buyer selected at random has watched a TV commercial only once before purchasing the product? Write the answer in percent. ______________ Compute the mean of the probability distribution.

Explanation / Answer

a. P(x>=2)=0.31+0.18+0.09+0.15=0.73

b. P(x=1)+P(x=2)=0.58

c. P(x=1)=0.27

d. Mean=Sum(x*P(x))=0.27+2*0.31+3*0.18+4*0.09+5*0.15=2.54

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