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5- A salesperson has a 20% chance of making a sale to any customer called upon. 1 calls were made what is the probability that: a) exactly 3 sales were made? b) at most one sale was made? c) at least two sales were made? d) what is the m ean and standard deviation of the number of sales?
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Answer #1

We use binomial distribution p(X) with the parameters n-5 and p 0.20 ap(x-3)-7,10.20 (-0.20)-10(0.20 (0.80) -0.012 3!2! 3(0.2

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