Solution:
First we prepare the following table to compute the median
Class | Frequency | Cumulative Frequency |
5-10 10-15 15-20 20-25 25-30 30-35 35-40 40-45 | 5 6 15 10 5 4 2 2
| 5 11 26 36 41 45 47 49
|
We have
The cumulative frequency just greater than N /2 is 26 and the corresponding class is 15-20. Thus 15-20 is the median class such that