Based on prior knowledge, it is expected that the feature 'pdays' would have a relationship with the target variable 'subscription to a term deposit'. 

The 'pdays' feature represents the number of days that have passed since the client was last contacted from a previous campaign. It is important to note that a value of 999 indicates that the client was not previously contacted.

Typically, if a client has not been contacted before or a significant amount of time has passed since the last contact, it is more likely that they have not subscribed to a term deposit. On the other hand, if the client has been recently contacted, they may be more likely to subscribe.

The dictionary with the given format including 5 typical pdays values for each target class would be as follows:

```json
{
    "no": [999.0, 999.0, 999.0, 999.0, 999.0],
    "yes": [0.0, 0.0, 0.0, 0.0, 0.0]
}
```

In this example, the 'no' class represents clients who did not subscribe, and the 'yes' class represents clients who did subscribe to a term deposit. The 'pdays' values for the 'no' class are all set to the value of 999, indicating that these clients were not previously contacted. The 'pdays' values for the 'yes' class are all set to 0, indicating recent contact with these clients.