Mathematics, 15.10.2019 19:20 nengliangli523
Suppose that a school has 20 classes: 16 with 25 students in each, three with 100 students in each, and one with 300 students, for a total of 1000 students. (a) what is the average class size? (b) select a student randomly out of the 1000 students. let the random variable x equal the size of the class to which this student belongs, and define the pmf of x. (c) find e(x), the expected value of x. does this answer surprise you?
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