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15. A certain type of light bulb has an average life of 500 hours, with a standard deviation of 100 hours. Find the percent of

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15. A certain type of light bulb has an average life of 500 hours, with a standard deviation of 100 hours. Find the percent of all bulbs having life spans in the following ranges. a) At least 400 hours (6) Less than 700 hours (c) Between 680 and 780 hours

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