Find out the arithmetic mean from the following data: {:("Marks (less than)"," "5,10,15,20,25,30),("Number of Students",22310,23,30,54,69,80):}

Find out the arithmetic mean from the following data: {:("Marks (less

1.	Find out the arithmetic mean from the following data: {:("Marks (less than)"," "5,10,15,20,25,30),("Number of Students",22310,23,30,54,69,80):}
Answer» SOLUTION :Since, we are GIVEN cumulative FREQUENCY distribution, at first we will convert the series into a simple frequency distribution and then, find out the MEAN marks. `barX=A+(sumfd')/(sum f)xxC` `=12.5 +54/80xx5` `=12.5+3.375 = 15.875` Arithmetic Mean = `15.875`.