Data was collected for 40 randomly selected trees growing in the median strip of a busy freeway. The height of each tree (in inches) was recorded. Data was recorded to the nearest whole inch. The data is summarized in the histogram below. 2 4 6 8 10 12 height (in) 30 35 40 45 50 55 60 65 70 Frequency [Graphs generated by this script: setBorder(54,40,20,15); initPicture(25.5,70,0,13);axes(134.6,2,1,null,2); fill="blue"; stroke="black"; textabs([165,0],"height (in)","above");line([30,-0.26],[30,0.26]); text([30,0],"30","below");line([35,-0.26],[35,0.26]); text([35,0],"35","below");line([40,-0.26],[40,0.26]); text([40,0],"40","below");line([45,-0.26],[45,0.26]); text([45,0],"45","below");line([50,-0.26],[50,0.26]); text([50,0],"50","below");line([55,-0.26],[55,0.26]); text([55,0],"55","below");line([60,-0.26],[60,0.26]); text([60,0],"60","below");line([65,-0.26],[65,0.26]); text([65,0],"65","below");line([70,-0.26],[70,0.26]); text([70,0],"70","below");textabs([0,115],"Frequency","right",90);rect([30,0],[35,2]);rect([35,0],[40,2]);rect([40,0],[45,3]);rect([45,0],[50,7]);rect([50,0],[55,13]);rect([55,0],[60,4]);rect([60,0],[65,8]);rect([65,0],[70,1]);] What is the minimum possible tree height for the data recorded for this histogram? Note: Each class contains its lower class boundary, but not its upper class boundary. minimum =