Download App

Board Question Paper : July 2022 — Statistics STD 12 Commerce — Question

Gujarat BoardEnglish MediumSTD 12 CommerceStatisticsBoard Question Paper : July 20221 Mark
MCQ
For the probability distribution of a discrete random variable $X . E(X)=5$ and $E \left( X ^2\right)=35$. What will be the variance of this distribution?
  • ✓
    $10$
  • B
    $20$
  • C
    $30$
  • D
    $40$
✓

Answer

Correct option: A.
$10$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "MCQ" from Board Question Paper : July 2022→Board Question Paper : July 2022 — all question types→Statistics STD 12 Commerce question papers→Gujarat Board STD 12 Commerce question papers→Gujarat Board question paper generator→

Similar questions

For a standard normal variate $Z$, what is the value of $P \left(-_{\infty}< Z \leq 0\right) ?$
→
Which variable of the following will be an illustration of discrete variable?
→
What is the value of rank correlation coefficient if $n=10$ and $3 \Sigma d^2=495\ ?$
→
In which method of index number does the base year change every year ?
→
The variance of a binomial variable is $4.$ What can be said about the skewness of the distribution?
→
The mean of a binomial distribution is $2 .$ If the probability of success for it is $0.4$, what will be its variance?
→
For the probability distribution of a discrete random variable $X, E(X)=5$ and $E \left( X ^2\right)=35$. What will be the variance of this distribution?
→
What is the modulus form for $1.05$ neighbourhood of $10 ?$
→
If the cost of living index number of the current year is $125$ with respect to the base year, what is the purchasing power of money in the current year ?
→
Which of the following options is true for difference event $A-B?$
→