A random variable X takes values −1,0,1 with probabilities 0.2,0.5,0.3. E(X) equals:
A random variable X takes values −1,0,1 with probabilities 0.2,0.5,0.3. E(X) equals:
- A. 0.1
- B. 0.0
- C. 0.2
- D. 0.3
Answer: A) 0.1
Explanation: −1(0.2)+0+1(0.3)=0.1.
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