A box contains 5 red and 5 blue balls. Two balls are withdrawn randomly. If they are the same color, then you win NT$11 dollars. However, if they are different colors, then you win-NT$10 dollars(that is, you lose NT$ 10 dollars). Calculate, (a) the expected value of the money you win. (b) the variance of the money you win.

I would be grateful for your help
Thanks

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