Practicing Success
Practicing Success
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For a random variable X, E(X) = 3 and $E(X)^2 =11,$ then variance of X is : |
8 5 2 1 |
2 |
The correct answer is Option (3) → 2 $E(X) = 3$ and $E(X)^2 =11$ so $σ^2=E(X)^2-(E(X))^2$ $=11-3^2=11-9$ (variance) $σ^2=2$ |
