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Suppose you are playing 20 hands of Texas Holdem. Let X=the number of times you get...

Suppose you are playing 20 hands of Texas Holdem. Let X=the number of times you get dealt a pocket pair out of your first 10 hands, and Y=the number of time you get dealt with at least one ace out of hands 11 through 20. Let Z=3X+Y. E(Z) is 5.08(i got it right) What is Variance(Z)?

The correct answer is 6.25 here but I couldn't get it.

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