Homework Help: finite math

Posted by margie on Thursday, April 14, 2011 at 2:47pm.

1. what are the mean and standard deviation for this distribution of weekly take-home pay amounts?

2. what percentage of the pay amounts lie within 1 standard deviations of the mean?

3. what percentage of the pay amounts lie within 2 standard deviations of the mean?

4. what percentage of the pay amounts lie within 3 standard deviations of the mean?

5. what is the range of the pay amounts?

finite math(?) - PsyDAG, Thursday, April 14, 2011 at 8:59pm
What distribution?

Find the mean first = sum of scores/number of scores

Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.

Standard deviation = square root of variance

http://en.wikipedia.org/wiki/File:The_Normal_Distribution.svg

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