Question

The following table shows the weights of $12$ workers in a factory. Find the mean weight of the workers.

Weight (in kg)	$60$	$64$	$68$	$70$	$72$
Number of workers	$3$	$4$	$2$	$2$	$1$

Answer 1

Weight$\left(x\right)$ (kg)	Number of workers$\left(f\right)$	$fx$
60	3	180
64	4	256
68	2	136
70	2	140
72	1	72

Total 12 784

Then arithmetic mean =$\frac{\Sigma fx}{\Sigma f}=\frac{784}{12}=65.33$ Kg