Answer:
Using a class size of 6.
Range = Highest value - Lowest value = 100 - 1 = 99
No. Of class = range/class size = 99/6 = 16.5 ~ 17/classes.
Upper-class limit of class (1) = Lower class limit of class (1) + class size - D
=> 1 + 6 - 1 = 7 - 1 = 6
.: UCL1 = 6
The table is shown below: