Calculate mean from the following data: {:("Marks",10-20,10-30,10-40,10-50,10-60,10-70,10-80,10-90),("Number of Students"," "4," "16," "56," "97," "124," "137," "146," "150):}

Calculate mean from the following data: {:("Marks",10-20,10-30,10-40,

1.	Calculate mean from the following data: {:("Marks",10-20,10-30,10-40,10-50,10-60,10-70,10-80,10-90),("Number of Students"," "4," "16," "56," "97," "124," "137," "146," "150):}
Answer» SOLUTION :The given data is in cumulative frequency form. It should FIRST be converted into simple frequency. Mean, `barX=A+(sum fd')/(sumf)xxC` `=45+20/150xx 10` `=45+1.33=46.33` THUS, Mean MARKS = 46.33.