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I have a histogram problem. http://docs.google.com/Doc?

I have a histogram problem.
http://docs.google.com/Doc?docid=0AQSS_4kCy7pdZGM5cWY0cXFfNTM2bTZ4cGR0&hl=en

I do not know how to find the # of students with 60% or more on tests..

Also I need to find the average and the median mark, and what the range is for each; i.e. 60-70, cannot be determined, etc.

I cannot seem to find anything on course notes.
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Dear Student, Please check the attached solutions of... View the full answer

We know that.doc

We know that,
Here, Frequency density =relative frequency density/ width of class
Thus, relative frequency= frequency density* width of class
Width = 10 (40-30=50-40……….)
Assuming total...

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