Question
Construct a frequency distribution table from the following cumulative frequency distribution:
| $C.I$ | $C.F$ |
| $5 - 10$ | $18$ |
| $10 - 15$ | $30$ |
| $15 - 20$ | $46$ |
| $20 - 25$ | $73$ |
| $25 - 30$ | $90$ |
