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Let X denote the sum of the numbers obta...

Let X denote the sum of the numbers obtained when two fair dice are rolled. Find the variance and standard deviation of X.

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MODERN PUBLICATION-PROBABILITY-EXERCISE
  1. Two dice are thrown simultaneously. If X denotes the number of sixes, ...

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  2. Find the mean and variance of the number obtained on a throw of an unb...

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  3. Let X denote the sum of the numbers obtained when two fair dice are ro...

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  4. Find the mean and variance of the probability distribution of the numb...

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  5. Find the probability distribution of number of doublets in three throw...

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  6. Two cards are drawn simultaneously ( without replacement) from a well-...

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  7. Two cards are drawn simultaneously (or successively without replacemen...

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  8. Two cards are drawn successively with replacement from a well-shuffled...

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  9. A coin is tossed 4 times. Let X denote the number of heads. Find the p...

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  10. Find the mean and variance of the number of heads on the throw of thre...

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  11. Two numbers are selected at random (without replacement) from the firs...

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  12. Two bad eggs are mixed accidently with 10 good ones. Find the probabil...

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  13. A class has 15 students whose ages are 14, 17, 15, 14, 21, 17, 19, 20,...

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  14. There are 40 scholars in a class, out of which 10 are sports- persons....

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  15. The probability distribution of a random variable 'X', taking values 1...

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  16. The probability distribution of a random variable 'X', taking values 1...

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  17. The probability distribution of a random variable 'X', taking values 1...

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  18. From a lot of 15 bulbs which include 5 defectives, a sample of 4 bulbs...

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  19. Find the probability distribution of white balls drawn when 3 balls ar...

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  20. Two numbers are selected at random (without replacement) from the firs...

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