A small-business Web site contains 100 pages and 60%, 30%, and 10% of the pages contain low, moderate, and high graphic content, respectively. A sample of four pages is selected without replacement, and X and Y denote the number of pages with moderate and high graphics output in the sample. Determine fXY (x; y), fX(x), E(X), fY j3(y) and E(Y jX = 3). Are X and Y independent?