Construct a continuous series frequency distribution table using the data given below:
 
Class
20 -30
35 -45
50 -60
65 -75
80 -90
Frequency
9
8
5
18
3
  
The continuous frequency table will look like:
  
Class
Frequency
 -
9
 -
8
 -
5
 -
18
 -
3