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Find the mean, the variance, and the standard deviation of the given probability distribution. The random...

Find the mean, the variance, and the standard deviation of the given probability distribution.

The random variable X is the number of shoes sold by a retail sales associate in a single month at the Shoe Stop Alley.  

x P(x)
1 0.12
2 0.27
3 0.38
4 0.14
5 0.09

A. Can you determine based on the table above if it is a probability distribution?

B. If it is, find the mean.

C. If it is, find the variance.

D.If it is, find the standard deviation.

Math   Statistics-And-Probability   
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