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A sample of 25 undergraduates reported the following dollar amounts of entertainment expenses last year: 724 771 684 709 747 686 715 683 741 759 684 727 731 684 761 705 739 754 703 705 752 746 707 7.74 Click here for the Excel Data File a. Find the mean, median, and mode of this information. (Round the "Median" to whole numbers and the "Mean" to 2 decimal places.) Mean Median Mode b. What are the range and standard deviation? (Round the "Range" to whole numbers and the "Mean" to 2 decimal places.) Range Standard deviation Use the Empirical Rule to establish an interval which includes about 95 percent of the observations. (Round your answers to 2 (ecimal places.) The interval is from up) to