Calculate the expectations and variances of x and y

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The buses carry, respectively, 35, 44, 34, and 49 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
E(X)=

Reference no: EM13201122

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