Mathematics, 12.01.2021 14:00, hsjsjsjdjjd

A university has 20,000 students. The student have ages with the following probabilities: 40% are age 18, 30% are age 19, 20% are age 20, and 10% are age 21. If a student is chosen at random, what is the student's expected age?

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A university has 20,000 students. The student have ages with the following probabilities: 40% are ag...