Prior knowledge:
The feature fnlwgt represents the number of units in the target population that the responding unit represents. It is a numeric variable. To determine the appropriate ranges of values, we can analyze it by comparing the fnlwgt values for individuals who earn more than 50000 dollars per year (yes) and those who do not (no).

Assuming we have a dataset with information about individuals' fnlwgt values and whether they earn more than 50000 dollars per year, we can proceed with the analysis.

Here's the dictionary with typical fnlwgt values for each target class:

```json
{
  "no": [10500, 24000, 35400, 42000, 48000],
  "yes": [18000, 31000, 42000, 55000, 67000]
}
```

Note: The values provided are just examples and should be replaced with actual values based on the analysis of the dataset.