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

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

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

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  5. In a meeting, 70% of the members favour and 30% oppose a certain propo...

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  6. The mean of the numbers obtained on throwing a die having written 1 on...

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  7. Suppose that two cards are drawn at random from a deck of cards. Let X...

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  8. A die is thrown 6 times. If ‘getting an odd number’ is a success, what...

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  9. A die is thrown 6 times. If getting an odd numebr is a succes, what is...

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  10. A die is thrown 6 times. If getting an odd numebr is a succes, what is...

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  11. A pair of dice is thrown 4 times. If getting a doublet is considered a...

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  12. There are 5% defective items in a large bulk of items. What is the pro...

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  13. Five cards are drawn successively with replacemnet form a well shuffle...

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  14. Four cards are drawn successively with replacement from a well shuffle...

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  15. Five cards are drawn successively with replacemnet form a well shuffle...

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  16. The probability that a bulb produced by a factory will fuse after 150 ...

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  17. The probability that a bulb produced by a factory will fuse after 150 ...

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  18. The probability that a bulb produced by a factory will fuse after 150 ...

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  19. The probability that a bulb produced by a factory will fuse after 150 ...

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  20. A bag consists of 10 balls each marked with one of the digits 0 to 9. ...

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