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September 2, 2014

September 2, 2014

Posted by **Leigh** on Thursday, May 20, 2010 at 11:54pm.

- Math 12 -
**drwls**, Friday, May 21, 2010 at 6:09amThe mean % score after 8 exams is M, and the sum of the scores is 8 M. After 10 exams the sum of scores is 8M + 100 and the new mean is (8M +100)/10 = 0.8M + 10. Compare that with M. It is lower by (0.2M -10)

A similar approach can be used for the new standard deviation. The answer will depend upon the previous 8-test standard deviation and mean.

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