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Exercise 7-20 A box contains 3 red balls and 2 black balls. A sample of size 2 is diple number of
red and let Y be the number of black. without replacement. Let X be the number of (a) Find
Var[X] (b) Find Var[Y] (c) Find Cov(X,Y). (d) Find Var[X+Y].

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Exercise 7-20 A box contains 3 red balls and 2 black balls. A sample .pdf

  • 1. Exercise 7-20 A box contains 3 red balls and 2 black balls. A sample of size 2 is diple number of red and let Y be the number of black. without replacement. Let X be the number of (a) Find Var[X] (b) Find Var[Y] (c) Find Cov(X,Y). (d) Find Var[X+Y].