Following table gives marks in Statistics of the students of a class. Find out mean marks. `{:("Mid-value",5,10,15,20,

In this series, mid-values are already given. The calculation of arithmetic mean involves the same procedure as in the case of exclusive series.

`barX= (sumfm)/(sumf)=995/50=19.9`
Mean Marks = 19.

Following table gives marks in Statistics of the students of a class. Find out mean marks. `{:("Mid-value",5,10,15,20,25,30,35,40),("Number of Student