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The lifetimes of light bulbs

The lifetimes of light bulbs of a particular type are normally distributed with a mean of 270 hours and a standard deviation of
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2. asked by Justice
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a manufacturing plant uses 3000 light bulbs whose lifetimes are independently normally distributed with mean 500 hrs, and
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2. asked by Liza
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2) The lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation
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2. asked by John
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The lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of
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2. asked by Michael
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he lifetimes of a certain brand of light bulbs are known to be normally distributed with a mean of 1600 hours and a standard
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2. 125 views
The lifetimes of a certain brand of light bulbs are known to be normally distributed with a mean of 1600 hours and a standard
1. 1 answer
2. 126 views
The lifetimes of a certain brand of light bulbs are known to be normally distributed with a mean of 1600 hours and a standard
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2. 77 views
The lifetimes of a certain brand of light bulbs are known to be normally distributed with a mean of 1600 hours and a standard
1. 1 answer
2. 69 views
The lifetimes of a certain brand of light bulbs are known to be normally distributed with a mean of 1600 hours and a standard
1. 1 answer
2. 71 views
The lifetimes of a certain brand of light bulbs are known to be normally distributed with a mean of 1600 hours and a standard
1. 1 answer
2. 77 views