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AP EAMCET2007MathematicsProbability

The probability distribution of a random variable X is given by array l|r|r|r|r|c =X & 0 & 1 & 2 & 3 & 4 (X=x) & 0.4 & 0.3 & 0.1 & 0.1 & 0.1 array The variance of X is

Options

  1. A1.76
  2. B2.45
  3. C3.2
  4. D4.8

Correct answer

A. 1.76

Step-by-step solution

Given, aligned Mean x & = _ i=0 ^4 p_i x_i=1.2 Variance & = _ i=0 ^4 p_i x_i^2- x ^2 & =3.20-1.44=1.76 aligned

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