7. Assume random variable x follows a probability distribution shown i

7. Assume random variable x follows a probability distribution shown
in the table below. Determine the mean and standard deviation of x. (Show all work. Just the answer, without supporting work, will receive no credit.)
X
-2
0
1
2
3
P(x)
0.1
0.1
0.4
0.2
0.2

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