## 3.6 Mean Using Frequency

For grouped data

Working hours
(x)
Employee
(f)
fx
2 2 4
3 2 6
5 3 15
8 2 10
9 1 9
$$\sum f =10$$ $$\sum fx = 50$$

$$\therefore \bar x = \frac{\sum fx}{\sum f} =\frac{50}{10}=5$$