# Mean and Standard Deviation of Demand Probability

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How do I figure out the mean and sample deviation of the following demands and probabilities:

DEMAND probability

7000 .05

8000 .10

9000 .25

10000 .30

11000 .20

12000 .10

https://brainmass.com/statistics/probability/mean-standard-deviation-demand-probability-59675

#### Solution Preview

The mean is

E(X)=7000*0.05+8000*0.10+9000*0.25+10000*0.30+11000*0.20+12000*0.10

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#### Solution Summary

This solution calculates the mean, variance and standard deviation with step-by-step calculations.

$2.49