83 70 74 86 67 80 87 87 85 70 70 83 80 68 69 71 Frequency a Complete the grouped frequency distribution for the data Note that the class width is 6 8 7 6 5 4 3 2 OHN W a biology test last week Here are the test scores for each of the eighteen students Test scores Test scores 1 0 65 5 to 71 5 71 5 to 77 5 77 5 to 83 5 83 5 to 89 5 b Using the classes from part a draw the frequency polygon for the data Note that you can add or remove classes from the figure Label each class with its midpoint 81 82 Frequency