Question

find the mean of the following by using step devision method marks below 10,20,30,40,50,60,70,80no of students 5,9,17,29,45,62,70,78​

Answer 1

Note:-

1. Marks are (xi)
2. No. of students (fi)
3. 'A' stands for assumed mean
4. 'h' stands for H.C.F of di
5. Sigma (Σ) is a sign used to represent 'sum of'
6. x bar stands for Mean