Data was collected for 300 fish from the North Atlantic. The length of the fish (in mm) is summarized in the GFDT below. Lengths (mm) Frequency 40 - 59 1 60 - 79 16 80 - 99 71 100 - 119 108 120 - 139 83 140 - 159 18 160 - 179 3 What is the upper class limit for the sixth class? upper class limit = Submit