Suppose that a class contains 10 boys and 15 girls, and suppose that eight students are to be selected at random from the class without replacement. Let X denote the number of boys that are selected, and let Y denote the number of girls that are selected. Find E(X − Y).

Probability and Statistics

4th edition

Authors: Morris H. DeGroot, Mark J. Schervish

ISBN: 978-0321500465

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