Question

Draw a histogram and frequency polygon for the marks of students given below:- Marks 0-10, 10-30, 30-45,45-50,50-60 and number of student 8, 32, 18, 9, 6

Answer 1

here the size of the intervals are not equal so we have used adjusted frequency formula.
to draw a histogram and frequency polygon you have to use the class intervals( marks) and the adjusted frequency to plot the graph.

frequency polygon mid point; class mark= (upper limit + lower limit)/2

hope this helps you...