Calculate expectations and variances of x and y

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Reference no: EM13108941

Four buses carrying 156 high school students arrives in Montreal. Buses carry, respectively, 30, 49, 33, and 44 students. One of the students is arbitarily selected. Let X denote number of students which were on bus carrying this arbitarily chosen student. One of 4 bus drivers is also arbitarily chosen. Let Y denote number of students on his bus. Calculate expectations and variances of X and Y:

E(X)=
Var(X)=
E(Y)=
Var(Y)=

Reference no: EM13108941

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