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Question
The class marks of a frequency distribution are: 15, 25, 35, 45, 55, 65 and 75. Determine the class limits.
Solution
The class marks are uniformly spread.
The class size is the difference between anty two consecutive class marks.
Class size
= 25 - 15
= 10
The lower limit of the first class
= `15 - (10)/(2)`
= 15 - 5
= 10
The upper limit of the first class
= `15 + (10)/(2)`
= 15 + 5
= 20
Thus, the first class interval is 10 - 20
Similarly, we can find the class limits of all the class marks given.
| Class Marks | Class limits |
| 15 | 10 - 20 |
| 25 | 20 - 30 |
| 35 | 30 - 40 |
| 45 | 40 - 50 |
| 55 | 50 - 60 |
| 65 | 60 - 70 |
| 75 | 70 - 80 |
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