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‘Board Question Paper : March 2022 — Statistics STD 12 Commerce — Question

Gujarat BoardEnglish MediumSTD 12 CommerceStatistics‘Board Question Paper : March 20221 Mark
MCQ
For the probability distribution of a discrete random variable $X, E(X)=5$ and $E \left( X ^2\right)=35$. What will be the variance of this distribution?
  • A
    $40$
  • B
    $30$
  • C
    $20$
  • ✓
    $10$
✓

Answer

Correct option: D.
$10$

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