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MHT CET202012 Oct 2020Morning ShiftMathematicsStatisticsActual

A random variable X takes the values 0,1,2 . Its mean is 1 2 . If P ( X =0)=0.3 , then P ( X =1)=

Options

  1. A0.1
  2. B0.5
  3. C0.2
  4. D0.4

Correct answer

C. 0.2

Step-by-step solution

Random variable array l x takes =0,1,2 x_ i P (x_ i )= Mean 1.2=(0 * 0.3)+1 P(x=1)+2 P(x=2) P(x=1)+2 P(x=2)=1.2 (1) P(x=1)+P(x=2)+P(x=0)=1 P(x=1)+P(x=2)=0.7 (2) array By Solving (1) & (2) array l P(x=2)=0.5 P(x=1)=0.2 . array

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