Here is a data set ( ) that has been sorted.

24.5 24.7 25.6 26.1 26.9 27.1 27.1 27.4 27.7 28 28.5 28.6 29.7 31.4 31.5 32.2 32.9 33.3 33.5 33.5 33.6 33.8 33.8 34.1 35.3 35.5 35.5 35.8 35.9 36.4 36.4 36.4 36.6 36.6 36.7 37.1 37.2 37.5 37.7 38.1 38.2 38.8 38.9 38.9 38.9 38.9 39 39.1 39.2 39.4 39.5 39.6 39.8 40 40.2 40.2 40.5 40.6 40.6 40.8 40.8 41.1 41.1 41.5 41.7 41.7 41.8 41.8 42.2 42.2 42.4 42.5 42.5 42.5 42.8 42.8 43.5 44.3 44.7 44.7 44.9 45 45 45.3 45.3 45.4 46 46 46.4 46.6 46.7 48 48.4 48.5 48.7 48.9 48.9 49.5 49.8 50.4 50.4 51.8 51.8 52.2 52.7 52.8 53.9 56.8 58.6

5 10 15 20 25 length (cm) 20 25 30 35 40 45 50 55 60 Frequency [Graphs generated by this script: setBorder(54,40,20,15); initPicture(15.5,60,0,29);axes(117.2,5,1,null,5); fill="blue"; stroke="black"; textabs([165,0],"length (cm)","above");line([20,-0.58],[20,0.58]); text([20,0],"20","below");line([25,-0.58],[25,0.58]); text([25,0],"25","below");line([30,-0.58],[30,0.58]); text([30,0],"30","below");line([35,-0.58],[35,0.58]); text([35,0],"35","below");line([40,-0.58],[40,0.58]); text([40,0],"40","below");line([45,-0.58],[45,0.58]); text([45,0],"45","below");line([50,-0.58],[50,0.58]); text([50,0],"50","below");line([55,-0.58],[55,0.58]); text([55,0],"55","below");line([60,-0.58],[60,0.58]); text([60,0],"60","below");textabs([0,115],"Frequency","right",90);rect([20,0],[25,2]);rect([25,0],[30,11]);rect([30,0],[35,11]);rect([35,0],[40,29]);rect([40,0],[45,28]);rect([45,0],[50,18]);rect([50,0],[55,8]);rect([55,0],[60,2]);]

Use the locator, give the value for the 50-Percentile: P50 =