1.

For a random variable X, E(X2 ) = 50 and V(X) =14, then what is E(X)?

Answer»

We know that V(X) = E(X2 )-[E(x)]2

14 = 50-[E(x)]2

[E(x)]2 = 50 – 14 = 36

Squaring on both sides, we get E(x) =√36 = 6



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