Mathematics, 13.06.2021 14:40 halimomohamed

Certain tubes manufactured by a company have a mean lifetime of 800 hours and a standard deviation of 6 hours. Find the probability that a random sample of 16 tubes taken from the group will have a mean lifetime (a) between 790 and 810 hours, (b) less than 785 hours, (c) more than 820 hours.

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Certain tubes manufactured by a company have a mean lifetime of 800 hours and a standard deviation o...