The CAT scores of 60 students are summarized below: `{:("Class ",40-50,50-60,60-70,70-80,80-90,90-100),("Frequency"," "10," "8," "12," "15," "10,"5):}`
Calculate the sample mean,the sample variance and the standard deviation for the grouped data

Calculate mode from the following data : {:("Class Interval",30-40,40-50,50-60,60-70,70-80,80-90,90-100),("Frequency"," "3," "4," "6," "10," "6," "4," "3):}

Find the mean of the data given in the following table. {:("Class",0-20,20-40,40-60,60-80,80-100),("Frequency"," "6," "4," "5," "7," "3):}

Calculate mean , median and mode from the following data : {:("Class Interval",30-40,40-50,50-60,60-70,70-80,80-90),("Frequency"," "18," "37," "45," "27," "15," "8):}

Calculate mode of the following sercies: {:("Class Interval",10-19,20-29,30-39,40-49,50-59,60-69,70-79),("Frequency"," "10," "12," "18," "30," "16," "6," "8):}

Draw a frequency curve for the data given below: {:("Class Interval",0-10,10-20,20-30,30-40,40-50,50-60,60-70),("Frequency",3,2,4,6,9,7,10):}

The mode from given grouped data would be {:("Class Interval",10-20,20-30,30-40,40-50,50-60),("Frequency",5,7,6,8,4):}

Caculate mode of the following data : {:("Marks",0-5,5-10,10-20,20-40,40-60,60-80,80-90,90-100),("Number of Students"," "5," "7," "9," "25" "," "30," "24," "8," "6):}

Calculate the mean deviation (about mean) and standard deviation of the following data: 25,50,48,70,45,33,51,31,60

The following table gives distributionn of marks secured by some stidents : {:("Wege Rate (Rs.)",10-20,20-30,30-40,40-50,50-60,60-70,70-80),("Number of Students"," "42," "38," "120," "84," "48," "36," "31):} Calculate the median marks secured by the students.