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   
200 - 2141
215 - 22916
230 - 24471
245 - 259108
260 - 2741
275 - 28918
290 - 3043


What is the upper class limit for the fourth class?

upper class limit =