For a random variable X, E(X) = 4 and $E(X^2)=20.$ Then variance of X is
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 4
$Var(x)=E(x^2)-(E(x))$
$=20-(4)^2$
$=4$
For a random variable X, E(X) = 4 and $E(X^2)=20.$ Then variance of X is
Correct answer: option 3
The correct answer is Option (3) → 4
$Var(x)=E(x^2)-(E(x))$
$=20-(4)^2$
$=4$