Data was collected for 300 fish from the North Atlantic. The length of the fish (in cm) is summarized in the histogram below.

20 40 60 80 100 140 142 144 146 148 150 152 154 length of fish (mm) Frequency [Graphs generated by this script: setBorder(61,40,20,5); initPicture(138.2,154,0,108);axes(1000,20,1,1000,20); fill="blue"; stroke="black";line([140,-2.16],[140,2.16]); text([140,0],"140","below");line([142,-2.16],[142,2.16]); text([142,0],"142","below");line([144,-2.16],[144,2.16]); text([144,0],"144","below");line([146,-2.16],[146,2.16]); text([146,0],"146","below");line([148,-2.16],[148,2.16]); text([148,0],"148","below");line([150,-2.16],[150,2.16]); text([150,0],"150","below");line([152,-2.16],[152,2.16]); text([152,0],"152","below");line([154,-2.16],[154,2.16]); text([154,0],"154","below");textabs([165,0],"length of fish (mm)","above");textabs([0,115],"Frequency","right",90);rect([140,0],[142,1]);rect([142,0],[144,16]);rect([144,0],[146,71]);rect([146,0],[148,108]);rect([148,0],[150,83]);rect([150,0],[152,18]);rect([152,0],[154,3]);]

What is the upper class limit for the seventh class?