The following table shows marks secured by the students of a class in an examination in English: {:("Marks",0-10,10-20,20-30,30-40,40-50),("Number of Students"," "20," "24," "40," "36," "20):} Calculte mean marks using Short-cut Method.

The following table shows marks secured by the students of a class in

1.	The following table shows marks secured by the students of a class in an examination in English: {:("Marks",0-10,10-20,20-30,30-40,40-50),("Number of Students"," "20," "24," "40," "36," "20):} Calculte mean marks using Short-cut Method.
Answer» SOLUTION : `(sumfd)/(sumf)=(120)/(140)=0.86` `barX=A+(sumfd)/(sumf)` `=25+0.86` `=25.86` MEAN MARKS = 25.86.