Compute the expectations and variances of x.


our buses carrying 151 high school students arrives in Montreal. The buses carry, respectively, 38, 41, 32, and 40 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.Compute the expectations and variances of X

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Basic Statistics: Compute the expectations and variances of x.
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