Let X be a discrete random variable. Then the variance of X is:
  • A$E(X^2)$
  • B$E(X^2) + (E(X))^2$
  • C$E(X^2) - (E(X))^2$
  • D$\sqrt{\text{E}(\text{X}^2)-(\text{E}(\text{X}))^2}$
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