Problem 7. Show the following: (1) Suppose that X and Y are independent random variables. Show that V(X - Y) = V(X) + V(Y). (2) Let X and Y be the number on a ticket in two subsequent draws with replacement from a opaque box with 20 tickets numbered by {1,2,..., 20}. Use Chebyshev's inequality to find a number e such that P(|XY|

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