Mr. Hill gave his students a biology test last week. Here are the test scores for each of the sixteen students. Test scores 86 74 78 90 80 77 83 82 81 73 84 78 74 79 85 89 (a)Complete the grouped frequency distribution for the data. (Note that the class width is 4.) Test scores Frequency 71.5-75.5 2 75.5-79.5 4 79.5-83.5 5 83.5-87.5 2 87.5-91.5 2