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December 21, 2014

December 21, 2014

Posted by **victoria** on Monday, April 19, 2010 at 11:26am.

- statistics -
**MathGuru**, Monday, April 19, 2010 at 8:52pmYou will need to find the z-score using a z-table. Remember the question is asking that the dealer wants only 5% of the cars to fail. Keep that in mind when looking for the z-score.

z = (x - mean)/sd -->z-score formula

Substitute the z-score you found, the mean, and the standard deviation into the formula, then solve for x.

I'll let you take it from there.

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