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Mathematics, 24.05.2021 14:00 jayy1474

The amount of time a certain brand of light bulb lasts is normally distribued with a nean of 1900 hours and a standard deviation of 45 hours. Out of 670 freshly installed
ight bulbs in a new large building, how many would be expected to last more than
1890 hours, to the nearest whole number?

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