Based on prior knowledge, we can analyze the relationship between the feature "duration" and the target variable "Does this client subscribe to a term deposit?". 

Typically, the duration of the last contact with a client might influence their decision to subscribe to a term deposit. Clients who spend more time discussing the details of the term deposit with the bank representative might be more likely to subscribe.

Here is a dictionary with the requested information:

```json
{
	"no": [200.0, 315.0, 130.0, 81.0, 90.0],
	"yes": [330.0, 1200.0, 550.0, 770.0, 320.0]
}
```

This provides a list of typical duration values for each target class. The "no" class represents clients who did not subscribe to a term deposit, and the "yes" class represents clients who did subscribe.