Wages in rupees | 50 | 60 | 70 | 80 | 90 |
No. of workers | 4 | 6 | 3 | 7 | 5 |
Wages
xi
|
No. of Workers
fi
|
xi fi
|
50
|
4
|
200
|
60
|
6
|
360
|
70
|
3
|
210
|
80
|
7
|
560
|
90
|
5
|
450
|
Total
|
25
|
1780
|