Mathematics
The marks obtained by 40 students of a class in an examination are given below. Present the data in the form of a frequency distribution using equal class-size, one such class being 10 - 15(15 not included).
3, 20, 13, 1, 21, 13, 3, 23, 16, 13, 18, 12, 5, 12, 5, 24, 9, 2, 7, 18, 20, 3, 10, 12, 7, 18, 2, 5, 7, 10, 16, 8, 16, 17, 8, 23, 21, 6, 23, 15
Statistics
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Answer
Since the given class is 10 - 15 (15 not included)
so, the class size = 5
Since, the maximum marks of the student equals to 24, thus the class intervals will be :
0 - 5, 5 - 10, 10 - 15, 15 - 20, 20 - 25
Frequency distribution table :
| Marks (Class Interval) | Tally-Marks | Frequency |
|---|---|---|
| 0 – 5 | 6 | |
| 5 – 10 | 10 | |
| 10 – 15 | 8 | |
| 15 – 20 | 8 | |
| 20 – 25 | 8 | |
| Total | 40 |
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Define the following terms:
(i) Variable
(ii) Class-interval
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(v) Class-limits
(vi) True class-limits
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(viii) Cumulative frequency of a class
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