A random variable X takes values 1,2,3 with probabilities 0.2,0.5,0.3 respectively. E(X) is:
A random variable X takes values 1,2,3 with probabilities 0.2,0.5,0.3 respectively. E(X) is:
- A. 2.1
- B. 2.0
- C. 1.8
- D. 2.3
Answer: A) 2.1
Explanation: E(X)=1(0.2)+2(0.5)+3(0.3)=2.1.
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