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  • Explain solution for RD Sharma maths class 12 chapter 31 Mean and Variance of a Random Variable exercise multiple choice questions question 9 maths textbook solution

Explain solution for RD Sharma maths class 12 chapter 31 Mean and Variance of a Random Variable exercise multiple choice questions question 9 maths textbook solution

Answers (1)

Answer:

              E\left ( X^{2} \right )-\left ( E\left ( X \right ) \right )^{2}

Hint:

              Fill the formula

Given:

              Let X be a discrete random variable, then the variance of X is

Solution:

Var iance \left ( X \right )=E\left ( X^{2} \right )-\left ( E\left ( X \right ) \right )^{2}

i.e.    Var=\sum X^{2} P\left ( X\right )-\left ( \sum XP\left ( X \right ) \right )^{2}

 

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