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There are 4 cards numbered 1,3,5 and 7.one number on one card.Two cards are drawn at random without replacement.Let X denote the sum of the numbers on the two drawn cards.Find the mean and variance of X. |
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Answer» There are 4 cards numbered 1,3,5 and 7.one number on one card.Two cards are drawn at random without replacement.Let X denote the sum of the numbers on the two drawn cards.Find the mean and variance of X. |
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