The Buses Carry Respectively 35 44 34 And 49 Students One Of The Studetns Is Ran

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)=

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