The data given below represent the marks obtained by 35 students:
21 26 21 20 23 24 22 19 24
26 25 23 26 29 21 24 19 25
26 25 22 23 23 27 26 24 25
30 25 23 28 28 24 28 28
Taking class intervals 19-20, 21-22 etc., make a frequency distribution for the above data.
Construct a combined histogram and frequency polygon for the distribution.
Solution:
Least mark = 19
Greatest marks = 30
Range = 30 – 19 = 11
| Class Interval | Actual Intervals | Frequency |
| 19-20 | 18.5-20.5 | 3 |
| 21-22 | 20.5-22.5 | 5 |
| 23-24 | 22.5-24.5 | 10 |
| 25-26 | 24.5-26.5 | 10 |
| 27-28 | 26.5-28.5 | 5 |
| 29-30 | 28.5-30.5 | 2 |
| Total | 35 |
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