Mathematics
The following table shows the weights (in kg) of 15 workers in a factory :
| Weight (in kg) | Number of workers |
|---|---|
| 60 | 4 |
| 63 | 5 |
| 66 | 3 |
| 72 | 1 |
| 75 | 2 |
Calculate the mean weight.
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Answer
where
f = frequency (Number of workers)
x = observation (weight)
| Weight (x) | Number of workers (f) | fx |
|---|---|---|
| 60 | 4 | 240 |
| 63 | 5 | 315 |
| 66 | 3 | 198 |
| 72 | 1 | 72 |
| 75 | 2 | 150 |
| Total | 15 | 975 |
So, ∑fx = 975 and ∑f = 15
Therefore,
= = 65.
Hence, mean weight = 65 kg.
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