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  • Provide Solution For R.D. Sharma Maths Class 12 Chapter 31 Mean and Variance of a random Exercise 31.2 Question 7 Maths Textbook Solution.

Provide Solution For  R.D. Sharma Maths Class 12 Chapter 31 Mean and Variance of a random Exercise 31.2 Question 7 Maths Textbook Solution.

Answers (1)

Answer:

\frac{1}{2}

Hint:

E\left ( X \right )=\sum_{i-1}^{n}X_{i}P_{i}

Given:

10 eggs are good and 2 eggs are bad

Solution:

\begin{aligned} &\begin{array}{|c|c|c|c|} \hline X & 0 & 1 & 2 \\ \hline P(X) & \frac{12}{11} & \frac{9}{22} & \frac{1}{22} \\ \hline \end{array}\\ \end{aligned}

\begin{aligned} &\begin{aligned} &\text { Mean } E(X)=\sum_{i=1}^{n} X_{i} P_{i} \\ &=0 \times \frac{12}{11}+1 \times \frac{9}{22}+2 \times \frac{1}{22} \\ &=\frac{11}{22} \end{aligned} \end{aligned}

=\frac{1}{2}

 

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