The frequency distritubution of the monthly salaries of 80 workers of a company are given below. Find the arithmetic mean of the salaries of the workers

Explanation

Here, we have to prepare class boundaries and class mid-values. Due to the different lengths of the class-intervals, by changing the origin and order, it is impossible to find out the average.
So , we have to prepare the following table at first.

`therefore barx=(sumxf)/(sumf)=(32390)/(80)=404.87`
`therefore ` the average of the monthly salary of 80 workers =Rs. 404.87