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November 28, 2014

November 28, 2014

Posted by **Jason L** on Friday, March 2, 2007 at 8:31am.

You can use z-scores and the z-score formula to compute the number of hours.

Formula: z = (x - mean)/sd -->sd = standard deviation

You are given the mean and standard deviation. You can find z using a z-table representing "no more than 6% risk" of having to pay up. Once you have that z-score, all you will need to do is solve the above equation for x.

I hope this will help get you started.

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