Q). Find the missing frequency of the mean og the following data is 44.8.
Dear student
Mean = Total of Fx / total of f
44.8 = 2030 + 30f / 43 + f
44.8 (43 + f ) = 2030 + 30f
1926.4 + 44.8f = 2030 + 30f
44.8 f - 30f = 2030 - 1926.4
14.8 f = 103.6
f = 103.6 / 14.8
f = 7
Regards
| X | 20 | 30 | 40 | 50 | 60 | 70 |
| f | 5 | ? | 15 | 10 | 8 | 5 |
| fX | 100 | 30f | 600 | 500 | 480 | 350 |
Mean = Total of Fx / total of f
44.8 = 2030 + 30f / 43 + f
44.8 (43 + f ) = 2030 + 30f
1926.4 + 44.8f = 2030 + 30f
44.8 f - 30f = 2030 - 1926.4
14.8 f = 103.6
f = 103.6 / 14.8
f = 7
Regards