7. A fruit grower claims that 20 % of his peach crop has been contaminated by medfly infestation. Find the probability that among 10 peaches inspected by this grower not more than 9 was contaminated by the medfly.

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This is a binomial distribution with parameters: n = 10, p = 0.20 Hence, P(Not more than 9) = 1 - P(More than 9) = 1 - P(10) = 1 - (1 - 0.20)10 = 0 ... See the full answer