The mean of the following data is
`{:("Class interval",f),(" "10-15,5),(" "15-20,7),(" "20-25,3),(" "25-30,4),(" "30-35,8):}`

Find the median of the following data. {:("Class Interval",f),(" "0-10,12),(" "10-20,13),(" "20-30,25),(" "30-40,20),(" "40-50,10):}

Find the approximate value of mean deviation about the mode of the following data. {:("Class Interval",f),(" "0-10,4),(" "10-20,6),(" "20-30,3),(" "30-40,9),(" "40-50,5):}

Find the mean deviation (approximately) about the mean for the following. {:("Class interval",f),(" "0-5,3),(" "5-0,4),(" "10-15,8),(" "15-20,10),(" "20-25,5):}

Draw a histogram for the following data: {:("Class Interval",f),(" "0-5,2),(" "5-10,10),(" "10-15,8),(" "15-20,6),(" "20-25,4):}

The mode of the following distribution is {("Class interval",f),(" "1-5,4),(" "6-10,7),(" "11-15,10),(" "16-20,8),(" "21-25,6):}

The median of the following frequency distribution is {:("Class interval",f),(" "0-10,5),(" "10-20,8),(" "20-30,7),(" "30-40,10),(" "40-50,20):}

Find the mean of the following continuous distribution. {("Class Interval",f),(" "0-10,8),(" "10-20,4),(" "20-30,6),(" "30-40,3),(" "40-50,4):}

Find the quartile deviation for the following grouped data. {:("Class Interval",f),(" "0-4,1),(" "5-9,3),(" "10-14,2),(" "15-19,4),(" "20-24,5),(" "25-29,3),(" "30-34,2),(" "35-39,4),(" "40-44,3),(" "45-49,3):}

Draw the frequency polygon for the following data by drawing a histogram: {:("Class Interval",f),(" "0-5,10),(" "5-10,20),(" "10-15,15),(" "15-20,30),(" "20-25,32),(" "25-30,44):}