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January 31, 2015

January 31, 2015

Posted by **Paula** on Saturday, April 9, 2011 at 1:41pm.

Number of sales(Probability)

1(0.05) 2(0.16) 3(0.20) 4(0.25) 5(0.18) 6(0.10) 7(0.04) 8(0.02)

- statistics -
**PsyDAG**, Sunday, April 10, 2011 at 12:15pmFind the mean first = sum of scores/number of scores

Sum of scores = (.05) + 2(.16)... + 8(.02) = ?

Number of scores = 1 + 2 + 3... + 8

Subtract each of the scores (.05, .16, .16, .2, .2, .2....) 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

I'll let you do the calculations.

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