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The probability mass function for X num...

The probability mass function for X number of major defects in a randomly selected appliance of a certain type is :

Find the expected value and variance of X.

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`E(X) = mu = sump_(i) x_(i)`
` = 0 + 0.15 + 0.90 + 0.81 + 0.20 = 2.06`
and `Var (X) = sump_(i)x_(i)^(2) - mu^(2)`
`Var(X) = 5.18 - 4.2436`
` = 0.9364 ~~ 0.94`
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