The mean time to failure of a light bulb is normally distributed with a mean of 10000 hours and a st


Question: The mean time to failure of a light bulb is normally distributed with a mean of 10000 hours and a standard deviation of 900 hours. What is the probablility that a light bulb will last less than 8500 hours?

Referring to problem 1_3.2, what is the probability that a light bulb will last more than 11500 hours.

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