Example From the following data, of the calculation of arithmetic mean, find the missing item.
wages in : 110 112
113
117
?
125
129
130
No. of
workers 25
17
13
15
14
8
7
2
Mean wage $ 115.86
Solution:
|
Wages in $
xi |
Number of workers
fi |
fixi
|
|
110 |
25 |
2750 |
|
112 |
17 |
1904 |
|
113 |
13 |
1496 |
|
117 |
15 |
1755 |
|
x |
14 |
14x |
|
125 |
8 |
1000 |
|
128 |
6 |
768 |
|
130 |
2 |
260 |
|
Total |
|
|
|
