Question:medium
The probability distribution of a random variable X is given below. Then, the standard deviation of X is.
The probability distribution of a random variable X is given below. Then, the standard deviation of X is.
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The standard deviation of a discrete random variable is the square root of the variance. The variance is calculated using the formula $\sigma^2 = E(X^2) - [E(X)]^2$. Always find the mean $E(X)$ first, then $E(X^2)$.
Updated On: Mar 30, 2026
- 5
- 11
- $\sqrt{11}$
- $\sqrt{5}$
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The Correct Option is C
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