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A dice is rolled thrice. If getting a fo...

A dice is rolled thrice. If getting a four is considered a success, find the mean and the variance of the probability distribution of the number of success.

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PRADEEP PUBLICATION-PROBABILITY-EXERCISE
  1. An unbiased coin is tossed 4 times. Find the mean and variance of the ...

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  2. Ten coins are thrown simultaneously. Find the probability of getting a...

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  3. A dice is rolled thrice. If getting a four is considered a success, fi...

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  4. Two cards are drawn with replacement from a well shuffled deck of 52 c...

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  5. An urn contains 4 white and 3 red balls. Find the probability distribu...

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  6. A coin is tossed 5 times. What is the probability that head appears an...

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  7. A coin is tossed 5 times. What is the probability that head appears on...

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  8. Using binomial distribution find the probability of obtaining "less th...

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  9. The probability of a man hitting a target is 1/4. If he fires seven ti...

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  10. In a hurdle race, a player has to cross 10 hurdles. The probability th...

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  11. A bag contains 10 balls each marked with one of the digit is 0 t0 9. I...

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  12. Find the probability distribution of the number of doublets in four th...

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

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  14. Three cards are drawn in succession form a well shuffled pack of 52 ca...

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  15. Determine the binomial distribution whose mean is 10 and whose standar...

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  16. If the sum of mean and variance of a binomial distribution is 4.8 for ...

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  17. If the sum of the mean and variance of a binomial distribution for 18 ...

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  18. A lot of 100 watches is known to have 10 defective watches. If 8 wath...

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  19. A pair of dice is thrown 7 times if getting a total of 7 is considered...

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  20. A bag contains 7 red, 4 white and 5 black balls. If four balls are dra...

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