Maharashtra State BoardHSC Arts 12th Board Exam
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Let the P. M. F. of a Random Variable X Be __ P(X) = 3-x)/10 for X = -1,0,1,2 Then E(X ) is __ - Mathematics and Statistics

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MCQ
Sum

Let the p. m. f. of a random variable X be __

P(x) = `(3-x)/10` for x = -1,0,1,2

= 0                        otherwise

Then E(X ) is ________.

Options

  • 1

  • 2

  • 0

  • -1

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Solution

0

x -1 0 1 2
P(x) `4/10` `3/10` `2/10` `1/10`
x.P(x) `(-4)/10` 0 `2/10` `2/10`

`sum x.P(x) = 0`

Concept: Probability Distribution - Expected Value, Variance and Standard Deviation of a Discrete Random Variable
  Is there an error in this question or solution?

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