SOLUTION: (1) if light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviatin of 500 hurs, what percentage of light bulobs have a life less than 250

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Question 609895: (1) if light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviatin of 500 hurs, what percentage of light bulobs have a life less than 2500 hours?

Answer by ewatrrr(24785) About Me  (Show Source):
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Hi

Light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours

what percentage of light bulbs have a life less than 2500 hours(the mean)? 50%