Class Interval | 30-39 | 40-49 | 50-59 | 60-69 | 70-79 |
Frequency | 24 | 16 | 09 | 15 | 20 |
Class Interval (Inclusive form) | Class Interval (Exclusive Form) | Frequency |
30-39 | 29.5-39.5 | 24 |
40-49 | 39.5-49.5 | 16 |
50-59 | 49.5-59.5 | 09 |
60-69 | 59.5-69.5 | 15 |
70-79 | 69.5-79.5 | 20 |
Steps of construction:
(a) Convert the data into the exclusive form. [Here, adjustment factor =0.5]
(b) Taking suitable scales, mark the class intervals on the x-axis and the frequency on the y-axis.
(c) Construct rectangles with class intervals as bases and corresponding frequencies as heights.