Question

Example 2 (By Shortcut Method or Assumed mean method)
Calculate Arithmetic Mean from the following data.
Roll No.
1 2 3 4 5 6 7 8 9 10
40 50 55 78 58 60 73 35 43 48
Marks​

Answer 1

1st draw the table for the given data

2nd find fixi

3rd write the xi and fixi from the table

4th find fixi/xi

5th finally we get the answer