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

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

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The correct Answer is:
`(sqrt(3))/(2)`
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KUMAR PRAKASHAN-PROBABILITY-Solutions of NCERT Exemplar Problems (Short Answer Type Questions)
  1. Prove that, P(A)=P(A cap B) +P(A cap barB)

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  2. Prove that P(A cup B) = P(A cap B)+P(A cap barB)+P(barA cap B)

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

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  4. In a dice game, a player pays a stake of ₹ 1 for each throw of a die. ...

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  5. Three dice are thrown at the sametime. Find the probability of getting...

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  6. Suppose 10,000 tickets are sold in a lottery each for ₹ 1. First prize...

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  7. A bag contains 4 white and 5 black balls. Another bag contains 9 white...

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  8. Bag-I contains 3 black and 2 white balls, Bag-II contains 2 black and ...

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  9. A box has 5 blue and 4 red balls. One ball is drawn at random and not ...

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

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  11. If a die is thrown 5 times. Then find the probability that an odd numb...

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  12. Ten coins are tossed. Then what is the probability of getting atleast ...

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  13. The probability of a man hitting a target is 0.25. He shoots 7 times, ...

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  14. A lot of 100 watches is known to have 10 defective watches. If 8 watch...

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  15. Consider the probability distribution of a random variable X: Cal...

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  16. The probability distribution of a random variable X is given below: ...

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  17. For the following probability distribution determine standard deviatio...

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  18. A biased die is such that P(4) = (1)/(10) and other scores being equal...

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  19. A dice is thrown three times. Let X be 'the number of two seen'. Find ...

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  20. Two biased dice are thrown together. For the first dice P(6) = (1)/(2)...

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