(i) The highest rectangle corresponds to the highest number of literate females, which is in the interval 15−20 years.
(ii) The class intervals are 10−15, 15−20, 20−25, 30−35, 35−40. Hence, the class width is 5.
(iii) The lowest rectangle corresponds to the lowest frequency, which is 320.
(iv) The class mark is the mid-point of the class interval.
i.e., Class mark = (upper limit + lower limit) / 2
Hence, the class mark of each class is as follows:
Class Interval |
Class Marks |
10-15 |
12.5 |
15-20 |
17.5 |
20-25 |
22.5 |
25-30 |
27.5 |
30-35 |
32.5 |
35-40 |
37.5 |
(v) The lowest rectangle corresponds to the least number of literate females, which is in the interval 10−15 years.