Below is given inclusive series. Convert it into exclusive series. Also write down the method of conversion of inclusive series into exclusive series.
Weekly wages | No. of workers |
40 – 49 | 7 |
50 – 59 | 17 |
60 – 69 | 25 |
Conversion of Inclusive series into Exclusive series:
Weekly wages | No. of workers |
39.5 – 49.5 | 7 |
49.5 – 59.5 | 17 |
59.5 – 69.5 | 25 |
Method of conversion of inclusive series into exclusive series :
1. First find the difference between the upper limit of a class interval and the lower limit of the next class interval.
2. Half the difference is added to the upper limit of each class interval and remaining half is deducted from the lower limit of each class-interval. In the question the upper limit of the first class interval is 49 and the lower limit of the second class interval is 50. The difference between them is one and its half is 0.5, 0.5 will be subtracted from 40, and 0.5 will be added to 49. Hence, first class interval will be 39.5 – 49.5.
