50 psychology students took a standardized test. The scores are summarized in the GFDT below. Scores Frequency 100 - 109 12 110 - 119 8 120 - 129 9 130 - 139 10 140 - 149 11 You would like to build a relative frequency distribution for this data set to easily compare it to another class of students. What is the relative fequency for the third class, 120 - 1297 Enter answer as a percent (but do not include the percent symbol). relative frequency - Here is a data set: 819 527 852 825 567 541 529 728 756 625 697 451 886 701 649 567 937 755 693 796 683 777 709 686 828 731 874 787 The goal is to construct a grouped frequency distribution table (GFDT) for this data set. The GFDT should have 10 classes with a "nice" class width. Each class should contain its lower class limit, and the lower class limits should all be multiples of the class width. This problem is to determine what the class width should be. What is the range of this data set? range = Using this information, if the goal is to have 10 classes, what is the nicest class width? optimal class width