Mathematics, 03.05.2021 23:00, ameliamadgett3

The amount of time a certain brand of light bulb lasts is normally distribued with a mean of 900 hours and a standard deviation of 35 hours. Out of 305 freshly installed light bulbs in a new large building, how many would be expected to last between 870 hours and 950 hours, to the nearest whole number?

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The amount of time a certain brand of light bulb lasts is normally distribued with a mean of 900 hou...