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A box contains 4 red and 8 white balls ....

A box contains 4 red and 8 white balls . If 4 balls are drawn one by one with replacement then the probability of getting 3 white balls is

A

`(16)/(81)`

B

`(8)/(81)`

C

`(32)/(81)`

D

`(1)/(32)`

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The correct Answer is:
A
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AAKASH SERIES-RANDOM VARIABLE -PRACTICE EXERCISE
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  2. If for a binomial distribution the mean is 6 and the standdard deviati...

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  3. A box contains 4 red and 8 white balls . If 4 balls are drawn one by o...

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  4. Probability of happening of an event in an experiment is 0.4 . The pro...

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  5. In a binomial distribution the mean is 12 and the standard deviation i...

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  6. A fair coin is tossed a fixed number times . If the probability of get...

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  7. A coin is biased so that the probability of falling head when tossed i...

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  8. If 10 coins are tossed then mean and variance of x and x denotes the n...

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  9. A die is thrown twice. If getting a number greater than four on the di...

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  10. Three dice are rolled 4 times . The probability of getting sum 17 exac...

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

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  12. The standard deviation of a poisson distribution is 4 then its mean is

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  13. If a random variable X has a Poisson distribution such that P(X=1)=P(X...

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  14. In a Poisson distribution P(X=0) =2P(X=1) then the standard deviation ...

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  15. In a Poission X, If P(X=0)=0.2 then the variance of the distribution i...

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  16. In a factory manufacturing certain spare parts 2% of the output is fou...

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  17. The incidence of an occupation disease to the workers of a factory is ...

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  18. If 2% of a given lot of manufactured parts are defective , then the pr...

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  19. Statement I : A fair coin is tossed 100 times . The probability of g...

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  20. For the binomial distribution (a + p)^(n) = ((1)/(2) + (1)/(2))^(10)...

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