Compute the expectations and variances of x and y

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Four buses carrying 148 high school students arrives in Montreal. The buses carry, respectively, 33, 47, 31, and 37 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 and variances of X and Y.

Reference no: EM13185552

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