What formula would i use can you break it down into baby

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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.

Reference no: EM13241408

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