In a class of 50 students, the number of students ni of each age i is shown
Question:
Age i ni
18……………… 20
19……………… 22
20……………… 4
21……………… 3
25……………… 1
If a student is to be selected at random from the class, what is the expected value of his age?
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Related Book For 
Probability And Statistics
ISBN: 9780321500465
4th Edition
Authors: Morris H. DeGroot, Mark J. Schervish
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