Width of Histogram

khalefah said:
i don't know how to find the width in the histogram! i am really bad in math statistic!

here's the histogram and it asked me, what class width is used in the histogram! :confused:

http://postimg.org/image/eybnwvbf5/


thanx in advance
Click to expand...
They just mean, "How wide are the bins of the histogram?" In this case the classes are identified by the central value instead of the bin boundaries, but since the marked values are all 5 units apart, and the units of the horizontal axis are "grades," the class width is "5 grades."
 
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