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Four buses carrying 143 high school students arrive to Montreal. The buses carry, respectively, 31, 41, 32, and 39 students. One of the studetns is...

Four buses carrying 143 high school students arrive to Montreal. The buses carry, respectively, 31, 41, 32, and 39 students. One of the studetns is randomly selected. Let X denote the number of students that were on the bus carrying this randomly selected student. One of the 4 bus drivers is also randomly selected. Let Y denote the number of students on his bus. Compute the expectations of X and Y

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