Posted by **Terra ** on Thursday, January 12, 2012 at 5:30pm.

The level of nitrogen oxides (NOX) in the exhaust of a particular car model varies with mean 0.9 grams per mile and standard deviation 0.15 grams per mile .

(a) What sample size is needed so that the standard deviation of the sampling distribution is 0.01 grams per mile ?

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**Terra **, Thursday, January 12, 2012 at 8:14pm
Never mind, got it. If anyone wants to know how to get it though...

1.5/(sq root of .9)=.01

Solve the equation, then square each side.

Answer=225

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**Terra **, Thursday, January 12, 2012 at 8:16pm
And by .9 I definitely meant n.....haha

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**Anonymous**, Wednesday, November 11, 2015 at 9:45am
That is a brutal solution lol

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**Anonymous**, Friday, December 11, 2015 at 8:29pm
Solve what equation? You didn't post an associated equation. and 1.5/sqrt of 0.9 does not equal .01

Then square what? Elaborate please.

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