Calculate the mean deviation with mean and median of the marks of the 80 students.
Marks
20-30
30-40
40-50
50-60
60-70
70-80
80-90
90-100
No. of students
3
8
9
15
20
13
8
4
Question No.15
Ten measurements gave the following results: Length in cms: 77, 73, 75, 70, 72, 76, 75, 72, 74, 76
Find variance and standard deviation.
Question No.16
Find the standard deviation and coefficient of variation of the numbers: 3.2, 4.6, 2.8, 5.2, 4.4