If the probability that a fluorescent light has a useful

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If the probability that a fluorescent light has a useful life of at least 800 hours is 0.9, find the probabilities that among 20 such lights

(a) Exactly 18 will have a useful life of at least 800 hours;

(b) At least 15 will have a useful life of at least 800 hours;

(c) At least 2 will not have a useful life of at least 800 hours.

Reference no: EM13576898

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