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If X is the numebr of tails in three tos...

If X is the numebr of tails in three tosses of a coin, determine the standard deviation of X.

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PRADEEP PUBLICATION-PROBABILITY-EXERCISE
  1. If E1 and E2 are independent events such that P(E1)=1/3 and P(E2)=1/6 ...

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  2. The probability of occurrence of an event A is 0.5 and that of B is 0....

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  3. If X is the numebr of tails in three tosses of a coin, determine the s...

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  4. A bag contains 5 red marbles and 3 black marbles. Three marbles are dr...

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  5. Three dice are thrown at the same time. Find the probability of gettin...

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  6. Four cards are successively drawn without replacement from a deck of 5...

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  7. A die is thrown 5 times. Find the probability that an odd number will ...

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  8. Prove that P(A)=P(AcupB)+P(AcapB), where A and B are any two events as...

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  9. Prove that P(AcupB)=P(AcapB)+P(AcapbarB)+P(barAcapB), where A and B ar...

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  10. A box has 5 blue and 4 red balls. One ball is drawn and not replaced. ...

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  11. If P(A)=2/5, P( C)=1/2 and P(AcapC)=1/5 then find P(A'capC').

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  12. Find k, if the probability distribution of a random variable X is as f...

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  13. Find the mean of the following probability distribution of a random va...

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  14. For a Binomial disribution mean is 5 and the number of trials is 50, f...

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  15. For a random variable X, sumX^2 P(X)=48.25 and mean =6.5 find the vari...

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  16. For a random variable X, sumXP(X)=1.5, find the mean of probability di...

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  17. A bag contains 3 white and 5 black balls. A ball is drawn at random. F...

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  18. For a random variable X, the variance of 6.25 and the mean is 6. find ...

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  19. If E1 and E2 are independent events and P(E1)=rho1, P(E2)=rho2 then fi...

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  20. If E1 and E2 are independent events and P(E1)=rho1, P(E2)=rho2 then fi...

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