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OpenStudy (anonymous):
Four buses carrying 141 high school students arrives in Montreal. The buses carry, respectively, 32, 44, 26, 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 variances of X and Y:
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