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I choose randomly a one word, and I decided to choose a word blue. Let random variable x be a length of the word blue. What is expected value and variance of a word blue?

So, random variable x = 4.

E(X) = Ʃ xi fX(xi)

i:xi∈S

x1 + x2 + x3 + x4 = 10.

expected value = 10.

Variance is

Var(X) = E[X − E(X)]^2

Var(X) = E[10 − E(4)]^2 = 6^2 = 36

Variance = 36

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# Random variable, expected value,Variance

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