Find the probabilities that among 20 such lights

Reference no: EM13313186

the If the probability that fluorecent light has a useful life of at least 500 hours is 0.85, find the probabilities that among 20 such lights

(a) 18 will have a useful life of at least 500 hours;

(b) At least 15 will have a useful life of at least 500 hours;

Reference no: EM13313186

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