pcruz2200 pcruz2200
  • 22-05-2023
  • Mathematics
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The amount of time a certain brand of light bulb lasts is normally distributed with a
mean of 1500 hours and a standard deviation of 45 hours. Out of 625 freshly installed
light bulbs in a new large building, how many would be expected to last between 1390
hours and 1620 hours, to the nearest whole number?

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