The following table gives the distribution of IQ’s (intelligence quotients) of 60 pupils of class V in a school.
Draw a frequency polygon for the above data.
Answers
A frequency polygon for the distribution of IQ’s (intelligence quotients) of 60 pupils of class V in a school is in the attachment below.
Extra information :
A frequency polygon is the polygon obtained by joining the midpoints of upper horizontal sides of all the rectangles in the histogram. Frequency polygons can also be drawn independently without drawing histograms.
For this we first find class mark of a class interval by using the formula
Class mark = ( upper limit + lower limit) /2
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