Ex 13.4, 11 - Chapter 13 Class 12 Probability (Term 2)
Last updated at Feb. 15, 2020 by Teachoo
Mean or Expectation of random variable
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Mean or Expectation of random variable
Ex 13.4, 11 Two dice are thrown simultaneously. If X denotes the number of sixes, find the expectation of X.Let X be the number of sixes occur So, value of X can be 0, 1 or 2 Total number of possible outcomes = 36 So, our probability distribution is The Expectation of X is given by E(X) = π=β_(π=1)^πβπ₯πππ = 0 Γ 25/36+1 Γ 10/36+2 Γ 1/36 = 10/36+2/36 = 12/36 = π/π