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Consider the data:
| Class | Frequency |
| \(65-85\) | \(4\) |
| \(85-105\) | \(5\) |
| \(105-125\) | \(13\) |
| \(125-145\) | \(20\) |
| \(145-165\) | \(14\) |
| \(165-185\) | \(7\) |
| \(185-205\) | \(4\) |
The difference of the upper limit of the median class and the lower limit of the modal class is
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