Enable text based alternatives for graph display and drawing entry

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[Graphs generated by this script: setBorder(47,40,20,5); initPicture(0,13,0,9);axes(1000,2,1,1000,2); fill="blue"; stroke="black";line([1,-0.18],[1,0.18]); text([1,0],"1","below");line([3,-0.18],[3,0.18]); text([3,0],"3","below");line([5,-0.18],[5,0.18]); text([5,0],"5","below");line([7,-0.18],[7,0.18]); text([7,0],"7","below");line([9,-0.18],[9,0.18]); text([9,0],"9","below");line([11,-0.18],[11,0.18]); text([11,0],"11","below");line([13,-0.18],[13,0.18]); text([13,0],"13","below");textabs([165,0],"data","above");textabs([0,115],"Frequency","right",90);rect([1,0],[3,3]);rect([3,0],[5,5]);rect([5,0],[7,9]);rect([7,0],[9,6]);rect([9,0],[11,7]);rect([11,0],[13,2]);]

Based on the histogram above, what is the class width?

Class width =

What is the sample size?

Sample size =