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Which of the following is variance of ra...

Which of the following is variance of random variable `x=x_(i)` and `P(x=x_(i))=p_(i)`

A

`sum(x_(i).P_(i))`

B

`sum(x_(i).p_(i))-mu^(2)`

C

`(sumX_(i).P_(i))-mu^(2)`

D

`2sum(x_(i)-mu)^(2).P_(i)`

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-RANDOM VARIABLE -EXERCISE - I
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  2. If 4 coins are tossed then the mean and variance of X where X is the n...

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  3. Which of the following is variance of random variable x=x(i) and P(x=x...

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  4. The mean of the 'Sixes' in two tosses of an unbiased die is

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  5. A die is rolled twice. Getting a number greater than 4 is called a 'Su...

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  6. A bag contains 4 white balls and 3 black balls. If two balls are drawn...

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  7. Four bad apples are mixed accidentally with 20 good apples. If 3 apple...

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  8. If two dice are rolled thrice, then the mean of X where X denotes the ...

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  9. In a binomial distribution n=20, q=0.75. Then mean =

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  10. In a binomial distribution the mean is 20, standard deviation is sqrt1...

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  11. If the mean of a binomial distribution with 9 trials is 6, then its va...

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  12. For binomial distribution n=10, q=0.4, then mean is

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  13. Six coins are tossed simultaneously . The probability of getting at le...

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  14. If a binomial distribution have parameters 9, 1//3 then P(X=4)=

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  15. If the mean and variance of a binomial distribution are 15//4 and 15//...

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  16. Let X be a binomially distributed variate with mean 10 and variance 5....

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  17. The mean and standard deviation of a binomial variate X are 4 and sqrt...

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  18. The mean and the variance of a binomial distribution are 4 and 2 respe...

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  19. X is a binomial variate with parameters n=6 and p. If 4P(X=4)=P(X=2), ...

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  20. The probability that a student is not swimmer is 1//4. Then the probab...

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