A random variable X takes values 0 and 2 with probabilities 0.75 and 0.25. Variance is:
A random variable X takes values 0 and 2 with probabilities 0.75 and 0.25. Variance is:
- A. 0.75
- B. 1.00
- C. 0.50
- D. 0.25
Answer: A) 0.75
Explanation: E(X)=0.5, E(X²)=1. Var=1−0.25=0.75.
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