Mathematics · Probability
Let X be a discrete random variable assuming values x1, x2, ..., xn with probabilities p1, p2, ..., pn, respectively. Then the variance of X is given by:
- 1√(E(X2) - [E(X)]2)
- 2E(X2) - [E(X)]2✓
- 3E(X2) + E(X)
- 4E(X2)
Correct answer
E(X2) - [E(X)]2
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