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Grouped data is data in a quantitative frequency distribution.[br]In working problems like these, you need to remember to[br]use both the class frequencies and the class midpoints [br]when computing the answer.[br][br]These problems are based on data from pages 738, 739, [br]744 and 747 of Mario Triola, "Elementary Statisitcs", 12th[br]edition, Pearson Education, Inc., 2014.