The Total solution for NCERT class 6-12
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Threecards are drawn at random (without replacement) from a well shuffled pack of 52cards. Find the probability distribution of number of red cards. Hence find themean of the distribution.
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An urncontains 5 are 2 black balls. Two balls are randomly drawn, withoutreplacement. Let X represent the number of black balls drawn. Whatare the possible values of X? Is X a random variable? If yes, find the mean andvariance of X.
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Twonumbers are selected at random (without replacement) from positive integers2,3,4,5, 6 and 7. Let X denote the larger of the two number obtained.Find the mean and variance of the probability distribution of X.
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