Question: Let be a random variable with the following probability distribution: Value of -10 x (of X ) 0.05 P( X=x) 0 0.40 10 0.20 20

Let be a random variable with the following probability distribution:

Value of

-10 x (of X ) 0.05 P( X=x)

0 0.40

10 0.20

20 0.05

30 0.30

Find the expectation and variance E (x) and variance Var ( x) of x.

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