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The lifetimes of projector bulbs

The lifetimes of projector bulbs of a particular type are normally distributed with a mean of 470 hours and a standard deviation
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2. asked by Justice
3. 1,211 views
The lifetimes of projector bulbs of a particular type are normally distributed with a mean of 470 hours and a standard deviation
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2. asked by justice
3. 953 views
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
3. 2,087 views
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
3. 757 views
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
3. 893 views
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
3. 1,415 views
The lifetimes of lightbulbs of a particular type are normally distributed with a mean of 290 hoursand a standard deviation of 6
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2. asked by sally
3. 1,200 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. 138 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. 87 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. 81 views