Mathematics, 22.01.2021 20:30 payshencec21
The amount of time a certain brand of light bulb lasts is normally distributed with a
mean of 1700 hours and a standard deviation of 45 hours. Using the empirical rule,
what percentage of light bulbs last between 1655 hours and 1745 hours?
Answers: 3
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1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?
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The amount of time a certain brand of light bulb lasts is normally distributed with a
mean of 1700...
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