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):}`

Calculate median , quartiles , 6th decile and 70 th percentile from the following data : {:("Marks (less than)",80,70,60,50,40,30,20,10),("Number of Students",100,90,80,60,32,20,13,5):}

Find out median marks from the following data : {:("Marks",0-10,10-20,20-30,30-40,40-50),("Number of Students"," "8," "30," "40," "12," "10):}

Find the mean for the following data. {:("Marks obtained",10-20,20-30,30-40,40-50,50-60,60-70),("Number of students",8,6,12,5,2,7):}

Find the mean deviation about the mean for the following data : {:("Marks obtained",0-10,10-20,20-30,30-40,40-50),("No. of students",5,8,15,16,6):}

Locate the median graphically from the following data : {:("Marks",0-10,10-20,20-30,30-40,40-50),("Number of Students"," "10," " 20," " 30," " 20," " 10):}

Find out mode from the following data : {:("Class Interval",5-10,10-15,15-20,20-25,25-30,30-35,35-40),("Number of Childern"," "4," "5," "3," "2," "6," "7," "3):}

Find the mean deviation about the mean for the following data: Marks obtained,10-20,20 - 30,30-40,40-50,50-60,60-70,70-80 Number of students,2,3,8,14,8,3,2

Caculate the median and mode from the following data : {:("Marks",0-10,10-20,20-30,30-40,40-50,50-60,60-70,70-80),("Number of Students"," "2," "18," "30," "45," "35," "20," "6," "3):}

Calculate the mean devation from the mean the following data: {:(,"Marks",0-10,10-20,20-30,30-40,40-50),(,"No. of stu.",5,8,15,16,6):}

Calculate the mean devation from the mean the following data: {:(,"Marks",0-10,10-20,20-30,30-40,40-50),(,"No. of stu.",5,8,15,16,6):}