A random variable X takes values 1,2,4 with probabilities 0.5,0.3,0.2. Variance is:
A random variable X takes values 1,2,4 with probabilities 0.5,0.3,0.2. Variance is:
- A. 1.29
- B. 1.09
- C. 1.49
- D. 0.89
Answer: A) 1.29
Explanation: E(X)=1.9, E(X²)=4.9. Variance=4.9−3.61=1.29.
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