The ages (in years) of teak trees in a plantation are grouped as follows. The classes are not continuous.
Age (years) | Number of trees
101–150 | 7
151–200 | 12
201–250 | 18
251–300 | 9
301–350 | 4
Using the information given, answer the questions below.
(i) Convert the discontinuous class intervals into continuous class intervals.
(ii) Determine the class size after conversion.
(iii) Calculate the class mark for each adjusted class interval.