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(0,19,0,8);axes(1000,2,1,1000,2); fill="blue"; stroke="black";line([1,-0.16],[1,0.16]); text([1,0],"1","below");line([4,-0.16],[4,0.16]); text([4,0],"4","below");line([7,-0.16],[7,0.16]); text([7,0],"7","below");line([10,-0.16],[10,0.16]); text([10,0],"10","below");line([13,-0.16],[13,0.16]); text([13,0],"13","below");line([16,-0.16],[16,0.16]); text([16,0],"16","below");line([19,-0.16],[19,0.16]); text([19,0],"19","below");textabs([165,0],"data","above");textabs([0,115],"Frequency","right",90);rect([1,0],[4,6]);rect([4,0],[7,7]);rect([7,0],[10,5]);rect([10,0],[13,3]);rect([13,0],[16,8]);rect([16,0],[19,4]);]

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

Class width =

What is the sample size?

Sample size =