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If X is a random variable with the follo...

If X is a random variable with the following probability distribution

then the variance of X is

A

`(65)/(4)`

B

`(65)/(2)`

C

`(65)/(3)`

D

65

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The correct Answer is:
A
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AAKASH SERIES-RANDOM VARIABLE -EXERCISE - II
  1. If the range of a random variable X is {0,1,2,3,4,……….} with P(X=k)=((...

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  2. A random variable x takes the values 0, 1, 2, 3 and its mean is 1.3. ...

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  3. If X is a random variable with the following probability distribution ...

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  4. A die a rolled and let x denote twice the number appearing on its face...

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  5. A pair of dice is thrown at a time. X is the maximum of the two number...

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  6. A sample of 2 itmes is selected at random from a bag containing 5 item...

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  7. A player tosses two coins. He wins Rs. 1 if 1 head appears, Rs 2 if 2...

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  8. Let X denote the profit of a business man. The probability of getting ...

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  9. The random variable takes the values 1,2,3,…….m. If P(X=n)=(1)/(m) to ...

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  10. Two cards are drawn successively one by one with out replacement from ...

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  11. A : If the difference between the mean and variance of a binomial dist...

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  12. If the standerd deviation of the binomial distribution (q+p)^(16) is 2...

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  13. If a binomial distribution has mean 2.4 and variance is 1.44, then n=

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

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  15. If the mean of the binomial distribution is 100. Then standard deviati...

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  16. Four bad apples are mixed accidentally with 20 good apples. Probabilit...

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  17. Two cards are drawn successively with replacement . The mean of number...

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  18. The mean and variance of a random variable X having binomial distribut...

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  19. The least number of times a fair coin must be tossed so that the proba...

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  20. The probabilty of hitting a target is 1/3. The least number of times t...

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