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Find the mean and the variance of random...

Find the mean and the variance of random variable X which is the number of successes in two tosses of a dice, where a success is defined as a number greater than 4.

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PRADEEP PUBLICATION-PROBABILITY-EXERCISE
  1. Three numbers are selected at random (without replacement) from first ...

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  2. A dice is thrown 120 times and getting '1' or '5' is considered a succ...

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  3. Find the mean and the variance of random variable X which is the numbe...

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

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  5. An unbiased coin is tossed 4 times. Find the mean and variance of the ...

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  6. An unbiased coin is tossed 4 times. Find the mean and variance of the ...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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