Certain tubes manufactuered by company has a mean lifetime of 800 hours and standard deviation of 60 hours. a. Find the probability that a random sample of 16 tubes have a mean lifetime of above 910. b. In how many lots out of 16 the lifetime would be greater than 910
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. Find the probability that a random sample of 16 tubes have a mean lifetime of above 910. b. In how many lots out of 16 the lifetime would be greater than 910
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