Mathematics, 12.03.2020 05:57 tony7135

The life of light bulbs is distributed normally. The variance of the lifetime is 400 and the mean lifetime of a bulb is 540 hours. Find the probability of a bulb lasting for at most 560 hours. Round your answer to four decimal places.

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The life of light bulbs is distributed normally. The variance of the lifetime is 400 and the mean li...