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There are 4 cards numbered 1, 3, 5 and 7...

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 varience of X.

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The correct Answer is:
`8, (20)/(3)`
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