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Each of $50$ students in class belongs to exactly one the four groups $A,B,C$ or $D$. The membership numbers for the four groups are as follows: $A:5,B:5,C:15,D:20$. First choose one of the $50$ students at random and let $X$ be the size of that student's group . Next, choose one the four groups at random and let $Y$ be its size.

(a) Write down the probability mass functions for $X$ and $Y$.
in Probability by Boss (10.9k points) | 23 views

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