If marks given by the second judge follow $Y = 10.5 + 2X$ and variance of $Y$ is $100$, find the variance of $X$.
- A. 50
- B. 25
- C. 99
- D. 49.5
✅ Correct Answer: 25
Explanation
Given $Y = 10.5 + 2X$ Variance formula $Var(Y) = b^2 Var(X)$ $100 = 4 Var(X)$ $Var(X) = 25$
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