The daily pocket expenses of `150` students in a school are given below:

Construct a frequency polygon representing the above data.

Explanation

We take two imagined classes, namely `40-50` and `120-130` , each with frequency 0.
Now, we have the following frequency table:

Taking suitable scale along the x-axis and another along the y-axis, we plot the following points:
`A(45, 0), B(55, 12), C(65, 16), D(75, 25), E(85, 20), F(95, 32), G(105, 27), H(115, 18)` and `I(125, 0).`
Join these points successively in pairs to get the required frequency polygon `ABCDEFGHI,` as shown below.