If the probability that a fluorescent light has a useful ife of at least 800 hours is 09, find the probabilites that among 30 such lights (a) What type of distribution is this? Bionomial distribution (b) exactly 28 will have a useful life of at least 800 hours P( X- 28 v) 09136 (c) at least 25 will have a usetul le of at least 800 hours P( (d) at least 12 will not have a useful ife of at least 800 hours P(

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