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 Students",5,7,9,10,8,6,3,2):}

Following table gives marks in Statistics of the students of a class.

1.	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 Students",5,7,9,10,8,6,3,2):}
Answer» Solution :In this series, mid-values are already given. The calculation of arithmetic MEAN involves thesameprocedure as in the case of exclusive series. `barX= (sumfm)/(sumf)=995/50=19.9` Mean MARKS = 19.