Four buses carrying 
high school students arrive to Montreal. The buses carry,
respectively, 
, 
, 
, and 
students. One of the studetns is randomly selected. Let 
denote the number of students that were on the bus carrying this
randomly selected student. One of the 
bus drivers is also randomly selected. Let 
denote the number of students on his bus. Compute the expectations
of
and
:
ScholarMatic: Explanation & Answer
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