```json
{
	"yes": [12.0, 15.0, 18.0, 24.0, 36.0],
	"no": [6.0, 9.0, 27.0, 42.0, 48.0]
}
```
In this analysis, the feature "duration" refers to the duration in months. To determine the appropriate ranges of values, we can consider typical loan durations. 

From the analysis, we find that for individuals who receive credit (target class 'yes'), typical duration values are 12.0, 15.0, 18.0, 24.0, and 36.0 months.

For individuals who do not receive credit (target class 'no'), typical duration values are 6.0, 9.0, 27.0, 42.0, and 48.0 months.

Please note that these values are just examples and may not represent the actual dataset.