Solved: Assuming that the distribution of hours that light bulbs, Basic Statistics

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Assuming that the distribution of hours that light bulbs

Question: The mean time that a certain model of light bulb will last is 400 hours, with a standard deviation equal to 50 hours.

a. Calculate the standardized value for a light bulb that lasts 500 hours.

b. Assuming that the distribution of hours that light bulbs last is bell-shaped, what percentage of bulbs could be expected to last longer than 500 hours?

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