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(0,37,0,9);axes(1000,2,1,1000,2); fill="blue"; stroke="black";line([1,-0.18],[1,0.18]); text([1,0],"1","below");line([7,-0.18],[7,0.18]); text([7,0],"7","below");line([13,-0.18],[13,0.18]); text([13,0],"13","below");line([19,-0.18],[19,0.18]); text([19,0],"19","below");line([25,-0.18],[25,0.18]); text([25,0],"25","below");line([31,-0.18],[31,0.18]); text([31,0],"31","below");line([37,-0.18],[37,0.18]); text([37,0],"37","below");textabs([165,0],"data","above");textabs([0,115],"Frequency","right",90);rect([1,0],[7,3]);rect([7,0],[13,5]);rect([13,0],[19,2]);rect([19,0],[25,8]);rect([25,0],[31,6]);rect([31,0],[37,9]);]

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

Class width =

What is the sample size?

Sample size =

X
MathQuill
   x  x    n  |   | (   ) π DNE
   x    (   ) π DNE
( ) ( ] [ ) [ ] —∞ DNE
< > or All Real Numbers DNE
log logn ln n  | | e 
sin cos tan arcsin arccos arctan  
[more..]