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Mathematics, 22.12.2021 18:40 Ashley606hernandez
The length of life (in hours) of a certain type of electric bulb is a random variable that is normally distributed with a mean of 500 hours and a standard deviation of 20 hours. The probability that the average lifetime of four bulbs is more than 520 hours, is equal to
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The length of life (in hours) of a certain type of electric bulb is a random variable that is normal...
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