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Question
Find the actual lower class limits, upper-class limits and the mid-values of the classes:
10 - 19, 20 - 29, 30 - 39 and 40 - 49.
Solution
| C. I. | Exclusive C. I. |
| 10 - 19 | 9.5 - 19.5 |
| 20 - 29 | 19.5 - 29.5 |
| 30 - 39 | 29.5 - 39.5 |
| 40 - 49 | 39.5 - 49.5 |
In case of frequency 9.5 - 19.5 the lower class limit is 9.5, the upper class limit is 19.5 and mid-value is
`(9.5 + 19.5)/2` = 14.5
In case of frequency 19.5 - 29.5 the lower class limit is 19.5, the upper class limit is 29.5 and mid-value is
`(19.5 + 29.5)/2` = 24.5
In case of frequency 29.5 - 39.5 the lower class limit is 29.5, the upper class limit is 39.5 and mid-value is
`(29.5 + 39.5)/2` = 34.5
In case of frequency 39.5 - 49.5 the lower class limit is 39.5, the upper class limit is 49.5 and mid-value is
`(39.5 + 49.5)/2` = 44.5
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