Question

How can we divide the salary data `{199,200,202,203,207,208,208,209,210,210,210,210,212,213,214,215,217,218,218,221}` in six classes?

Answer 1

Please see below.

Explanation:

The difference between the smallest number being `199` and the largest being `221` is `22`.

Hence let us divide them in `6` as follows:
`198-201`, `202-205`, `206-209`, `210-213`, `214-217` and `218-221`

Now let us put al salaries in relevant classes and it is

198-201 - `color(red)(199-200)`
202-205 -`color(red)(203-202)`
206-209 -`color(red)(209-208-207-208)`
210-213-`color(red)(212-210-210-210-210-213)`
214-217-`color(red)(217-215-214`
218-221-`color(red)(221-218-218`

Hence frequency distribution is

`198-201-color(blue)2`
`202-205-color(blue)2`
`206-209-color(blue)4`
`210-213-color(blue)6`
`214-217-color(blue)3` and
`218-221-color(blue)3`