Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • School
  • Explain Solution R.D. Sharma Class 12 Chapter 31Mean and Variance of a Random Variable Exercise 31.2 Question 20 maths Textbook Solution.

Explain Solution R.D. Sharma Class 12 Chapter 31Mean and Variance of a Random Variable  Exercise 31.2 Question 20 maths Textbook Solution.

Answers (1)

Answer:

\frac{19}{9}

Hint:

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

Given:

A die has thrown

Solution:

\begin{aligned} &P(X=5)=\frac{9}{27} \\ &P(X=4)=\frac{6}{27} \\ &P(X=3)=\frac{4}{27} \\ &P(X=-3)=\frac{8}{27} \\ &E(X)=\sum_{i=1}^{n} X_{i} P_{i} \\ \end{aligned}

\begin{aligned} &=5 \times \frac{8}{27}+4 \times \frac{6}{27}+3 \times \frac{4}{27}+(-3) \times \frac{8}{27} \\ &=\frac{45+24+12-24}{27} \\ &=\frac{57}{27}=\frac{19}{9} \end{aligned}

Posted by

infoexpert21

View full answer

Crack CUET with india's "Best Teachers"

  • HD Video Lectures
  • Unlimited Mock Tests
  • Faculty Support
cuet_ads

Similar Questions

Trending Articles/News

anam-khan

SC asks CBSE to protect students affected by OSM evaluation in admissions
anam-khan

CBSE Class 12 Compartment Result 2026 LIVE: 12th supplementary marksheet out at results.digilocker.gov.in
anam-khan

CBSE Class 12 supplementary results 2026 out; 53.08% students pass

Latest Question