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Mean and Standard Deviation of Demand Probability

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

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.

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