Mathematics · Probability
Let X be the random variable taking values 1, 2, ..., n for a fixed positive integer n. If P(X = k) = 1n for 1 ≤ k ≤ n, then the variance of X is:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1(n + 1)(n + 2)6
- 2n2 - 16
- 3n2 + 112
- 4n2 - 112✓
Correct answer
n2 - 112
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