The following table shows marks obtained by the students of a class in their test in English: {:("Marks",0-10,10-20,20-30,30-40,40-50),("Number of Students"," "20," "24," "40," "36," "20):} Calculate arithmetic mean using Step-deviation method.

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

1.	The following table shows marks obtained by the students of a class in their test in English: {:("Marks",0-10,10-20,20-30,30-40,40-50),("Number of Students"," "20," "24," "40," "36," "20):} Calculate arithmetic mean using Step-deviation method.
Answer» SOLUTION : `(sumfd')/(sumf)=12/140=0.086` `"MEAN, "barX=A+(sumfd')/(sumf)XXC` `=25+0.086xx10` `=25+0.86` `=25.86` ARITHMETIC Mean = 25.86 MARKS.