4. (10 points) X are discrete random variables. The following table summarizes the probability mass function...

Question

Question

Answer 1

Answer #1

The formula for E(X) = $\sum$ XP(X)

V(X) = E(X²) - E²(X) =. $\sum$ X²P(X) - E²(X)

Now we construct the following table for calculation

Therefore by the formula we have

E(X) = $\sum$ XP(X) = 2.1

V(X) = 7 - (2.1)² = 7 - 4.41 = 2.59

Answer 2

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