Mathematics, 13.04.2021 01:40 gabbym39077

The amount of time a certain brand of light bulb lasts is normally distributed with a mean of 1400 hours and a standard deviation of 85 hours. What percentage light

bulbs last between 1310 hours and 1470 hours, to the nearest tenth?

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The amount of time a certain brand of light bulb lasts is normally distributed with a mean of 1400...