Find the mean wage of 200 workers of a factory where wages are classified as follows:
Class
100-150
150-200
200-250
250-300
300-350
350-400
400-450
450-500
500-550
Frequency
4
8
14
42
50
40
32
6
4
Answers
Given : wage of 200 workers of a factory
To Find : Mean Wages
Solution:
Class Mean d = (Mean - 325)/50 f df
100-150 125 - 4 4 -16
150-200 175 - 3 8 -24
200-250 225 - 2 14 -28
250-300 275 - 1 42 -42
300-350 325 0 50 0
350-400 375 1 40 40
400-450 425 2 32 64
450-500 475 3 6 18
500-550 525 4 4 16
200 28
Mean = 325 + 50 x 28/200
= 325 + 7
= 332
mean wage of 200 workers = 332
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