Find the mean and standard deviation of X:

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)
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(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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...probability, and then divide by the total number of pairs (7)
Given this mean probability, you can then find the standard deviation as such.
Subtract each individual ...