Let y denote the number of students on his bus. compute the, Ask an Expert

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Four buses carrying 155 high school students arrive to Montreal. The buses carry, respectively, 40, 42, 25, and 48 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 and variances of X and Y:

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