Question
Suppose the length of life of large shipments of flashlight batteries is normally distributed with a mean equal to 150 hours a standard deviation of
- Suppose the length of life of large shipments of flashlight batteries is normally distributed with a mean equal to 150 hours a standard deviation of 20 hours.
a. What is the probability that a battery will last longer than 200 hours?
b. What is the probability that 2 of a random sample of 5 batteries will last longer than 200 hours?
c. Find the probability that the mean of a random sample of 100 batteries drawn from the shipment has a value which is no more than 5 hours from the shipment mean.
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Calculus Early Transcendentals
Authors: James Stewart
8th edition
1285741552, 9781305482463 , 978-1285741550
