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Four buses carrying 156 high school students arrive to Montreal. Buses carry, respectively, 39, 48, 28, and 41 students. One of students is arbitarily selected. Let X denote number of students which were on bus carrying this arbitarily selected student. One of 4 bus drivers is also arbitarily selected. Let Y denote number of students on his bus. Caculate expectations of X and Y: E(X)=?

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