Find the mean of daily wages of 60 workers in a factory as per data given below:
Daily wages (in Rs) | 90 | 110 | 120 | 130 | 150 |
No. of workers | 12 | 14 | 13 | 11 | 10 |
Let’s draw the table and calculate the total frequency.
To calculate mean we need the relative value of variables which is xi×fi. To attain xi×fi .we have to multiply the value of variables (xi)to the frequency of the value (f1).
Daily wages (in Rs) (xi) | No. of workers (fi) | (xi×fi) |
90 | 12 | 1080 |
110 | 14 | 1540 |
120 | 13 | 1560 |
130 | 11 | 1430 |
150 | 10 | 1500 |
∑fi = 60 | ∑xi×fi = 7110 |
By putting the formula of;
Mean = 
= 118.50
1