Question

draw a frequency polygon and histogram for the following data
aga : 0- 10,10-20,20-30,30-40,40-50,50-60,60-70,70-80
residedents : 150,300,500,8oo,1000,900,400,100​

Answer 1

Mark the class intervals along the X-axis and the number of students along the Y-axis. Draw a histogram for the given data. Now mark the mid points of the upper sides of the consecutive rectangles. The mid points are joined with the help of a ruler. Note that, the first and last edges of the frequency polygon meet at the mid point of the vertical edges of the first and last rectangles.