A random variable X takes values 2 and 5 with probabilities 0.7 and 0.3. E(X) is:
A random variable X takes values 2 and 5 with probabilities 0.7 and 0.3. E(X) is:
- A. 2.9
- B. 3.1
- C. 3.5
- D. 2.5
Answer: A) 2.9
Explanation: E(X)=2(0.7)+5(0.3)=2.9.
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