Mathematics, 06.05.2020 02:07 Adailson8890
G A group of 50 physical doctors from four countries consists of 5 Americans, 10 British, 15 Chinese and 20 Danes. First, choose one of the 50 doctors at random and let X be the size of that doctor’s group. Next, choose one of the four groups at random and let Y be its size. (With or without replacement do not make any difference here: recall that all random choices are with equal probability, unless otherwise specified.) (a) Write down the probability mass functions for X and Y . (b) Compute EX and EY . (c) Compute V ar(X) and V ar(Y ).
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G A group of 50 physical doctors from four countries consists of 5 Americans, 10 British, 15 Chinese...
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