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Question 213:

Let X be a random variable with the following probability distribution. Find the expectation and variance E(X) Var (X)of X.

Value
x of X P(X=x)
10 0.10
20 0.30
30 0.05
40 0.10
50 0.05
60 0.40

What formula would I use? Can you break it down into baby steps so I can understand how you got the answer? Thanks

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