A random variable X takes values 0,1,2 with probabilities 0.2,0.5,0.3. E(X²) is:
A random variable X takes values 0,1,2 with probabilities 0.2,0.5,0.3. E(X²) is:
- A. 1.7
- B. 2.1
- C. 1.5
- D. 2.5
Answer: A) 1.7
Explanation: 0²(0.2)+1²(0.5)+2²(0.3)=1.7.
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