# Calculate Mean and Standard Deviation

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The random variable X is the number of houses per month sold by a realtor. The probability distribution is given below. Find the mean and standard deviation of X:

X (houses sold) / f(x)

____________________________________________

(0 , 0.24)

(1 , 0.01)

(2 , 0.12)

(3 , 0.16)

(4 , 0.01)

(5 , 0.14)

(6 , 0.11)

(7 , 0.21)

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##### Solution Summary

This will show you how to calculate means and standard deviations.

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Hello. In this case, you should know that f(x) is the same as y.

You should firstly find the mean of X

How you do this is simple:

You add up all of the value of each ...

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