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The lifetimes of a certain brand of light bulbs are known to be normally distributed with a mean of 1600 hours and a standard d...Question
The lifetimes of a certain brand of light bulbs are known to be normally distributed with a mean of 1600 hours and a standard deviation of 400 hours. A random sample of 64 of these light bulbs is taken. The probability is 0.1492 that the sample mean lifetime is more than how many hours?
1652
1500
1724
1580
1578
1652
1500
1724
1580
1578
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