- Probability part 26 (Mean of random variables)
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- Probability part 27 (Mean of random variables :- Example)
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- Probability part 29 (Example variance and Standard Deviation)
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- Probability part 28 (variance, Standard Deviation of random variables)
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The mean of the numbers obtained on throwing a die having written 1 on three faces, 2 on two faces and 5 on one face is
Two the numbers are selected at random (without replacement) from first six positive integers. Let X denote the larger of the two numbers obtained. Find the probability distribution of X. Find the mean and variance of this distribution.
An urn contains 3 white and 6 red balls. Four balls are drawn one by one with replacement from the urn. Find the probability distribution of the number of red balls drawn. Also find mean and variance of the distribution.
Five bad oranges are accidently mixed with 20 good ones. If four oranges are drawn one by one successively with replacement, then find the probability distribution of number of bad oranges drawn. Hence find the mean and variance of the distribution.