Compute the expectations of x and y

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Four buses carrying 144 high school students arrive to Montreal. The buses carry, respectively, 30, 50, 25, and 39 students. One of the students 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.

Reference no: EM13181463

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