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November 25, 2014

November 25, 2014

Posted by **Lori** on Saturday, April 17, 2010 at 11:18pm.

- Math -
**MathMate**, Sunday, April 18, 2010 at 7:48amThe standard deviation, σ, is $50. The mean is $900.

To spend less than $750 means that the spending is less than mean - 3σ.

The probability of this happening, assuming the spending follows the normal distribution curve, can be found from the normal distribution tables, for example:

http://www.math.unb.ca/~knight/utility/NormTble.htm

where the probability for the tail end of 3σ is 0.001350, or 0.135%.

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