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?

A First Course in Probability (10th Edition)
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ISBN:9780134753119
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Chapter1: Combinatorial Analysis
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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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