The formula for the variance of a random variable X is:
The formula for the variance of a random variable X is:
- A. E(X) − E(X²)
- B. E(X²) − [E(X)]²
- C. [E(X)]² − E(X²)
- D. E(X²) + [E(X)]²
Answer: B) E(X²) − [E(X)]²
Explanation: Variance Var(X) is mathematically defined as the expected value of the squared deviation from the mean: E(X²) − [E(X)]².
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