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  • Please Solve R.D.Sharma class 12 Chapter 31 Mean and Variance of a random Variable Exercise Fill in the Blanks Question 1 Maths Textbook Solution.

Please Solve R.D.Sharma class 12 Chapter 31 Mean and Variance of a random Variable  Exercise Fill in the Blanks Question 1 Maths Textbook Solution.

Answers (1)

Answer:

E\left ( X \right )=\sum_{i=1}^{n}x_{i}p_{i}

Hints: -You must know the rule for finding mean from Random variable.

Given: -

X:x_{1}x_{2}-------x_{n}

P\left ( X \right ):p_{1}p_{2}-------p_{n}

Solution:

Mean \begin{aligned} &=E(X)=\sum_{i=1}^{n} X_{i} P\left(X=X_{i}\right) \\ \end{aligned}

\begin{aligned} &=x_{1} p_{1}+x_{2} p_{2}+x_{3} p_{3}+---+x_{n} p_{n} \\ &E(X)=\sum_{i=1}^{n} x_{i} p_{i} \end{aligned}

 

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