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[" (AI "2011C)," There are "4" cards num...

[" (AI "2011C)," There are "4" cards numbered "1,3,5" and "7017" ) "],[" s lost.From "," number on one card.Two cards are drawn at "],[" two cards "," random without replacement.Let "X" denote "],[" found to be "," the sum of the numbers on the two drawn "],[" of the lost "," cards.Find the mean and variance of "X" ."]

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