Mathematics
If the classes of a frequency distribution are 1 - 10, 11 - 20, 21 - 30, ….., 61 - 70, then the upper limit of the class 11 - 20 is
20
21
19.5
20.5
Measures of Central Tendency
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Answer
On converting the class from discontinuous intervals into continuous intervals.
Adjustment factor = (Lower limt of one class - Upper limit of previous class) / 2
| Classes before adjustment | Classes after adjustment |
|---|---|
| 1 - 10 | 0.5 - 10.5 |
| 11 - 20 | 10.5 - 20.5 |
| 21 - 30 | 20.5 - 30.5 |
| 31 - 40 | 30.5 - 40.5 |
| 41 - 50 | 40.5 - 50.5 |
| 51 - 60 | 50.5 - 60.5 |
| 61 - 70 | 60.5 - 70.5 |
From table, the upper limit of the class 11 - 20 is 20.5
Hence, Option 4 is the correct option.
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