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QUESTION
Certain tubes manufactured by a company have a mean life of 800 hours and standard deviation of 60 hours.
Certain tubes manufactured by a company have a mean life of 800 hours and standard deviation of 60 hours. Find the probability that a random sample of 16 tubes taken from the group will have a mean life of:a)Between 790 and 810 hoursb)Less than 785 hoursc)more than 820 hours d)between 770 and 830 hours
