imo class 12 probability

A random variable X takes values −1,0,1 with probabilities 0.2,0.5,0.3. E(X) equals:

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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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