The following table shows the weights of 12 workers in a factory.
Weight (in kg) | 60 | 63 | 66 | 69 | 72 |
No. of workers | 4 | 3 | 2 | 2 | 1 |
Find the mean weight of the workers.
Let’s draw the table and calculate the relative value of variables.
Weight (in kg) (xi) | No. of workers (fi) | (xi×fi) |
60 | 4 | 240 |
63 | 3 | 189 |
66 | 2 | 132 |
69 | 2 | 138 |
72 | 1 | 72 |
∑fi = 12 | ∑xi×fi = 771 |
By putting the formula of mean we get;
Mean =
= 64.25 kg
So the mean weight of the workers will be 64.25kg.