Based on prior knowledge, capital-gain refers to the profit or gain from the sale of an investment or property. In the context of earning more than 50000 dollars per year, individuals with higher capital-gain values are more likely to earn above this threshold. However, it is important to note that the relationship may not be linear, and other factors may influence an individual's income.

Here is the dictionary with possible values of capital-gain for each target class:

```json
{
	"no": [0, 1500, 2000, 3000, 4000],
	"yes": [5000, 7500, 10000, 15000, 20000]
}
```

Please note that these values are just examples and may not represent the entire range of capital-gain values for each target class.