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There are 4 cards numbered 1,3,5 and 7, one number on one card
Question

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

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