The life of light bulbs is distributed normally. The variance of the lifetime is 625 and the mean lifetime of a bulb is 520 hours. Find the probability of a bulb lasting for at most 564 hours. Round...

Extracted text: The life of light bulbs is distributed normally. The variance of the lifetime is 625 and the mean lifetime of a bulb is 520 hours. Find the probability of a bulb lasting for at most 564 hours. Round your answer to four decimal places.