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There are 116 students taking an exam on campus. There are 26 students in Building 1, 72 students in Building 2, and 18 students in

There are 116 students taking an exam on campus. There are 26 students in Building 1, 72 students in Building 2, and 18 students in Building 3.

(a) Suppose we select a building uniformly at random. What is the expected number of students in the building?

(b) Suppose we instead select a student uniformly at random. What is the expected number of students in their building?

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