Based on prior knowledge, we can determine the following ranges for the feature BMXBMI:

- For adults, the Body Mass Index (BMI) ranges are generally considered as follows:
  - Underweight: BMI less than 18.5
  - Normal weight: BMI between 18.5 and 24.9
  - Overweight: BMI between 25.0 and 29.9
  - Obese: BMI equal to or greater than 30.0

- For seniors, the BMI ranges can vary slightly due to age-related factors:
  - Underweight: BMI less than 22.0
  - Normal weight: BMI between 22.0 and 27.0
  - Overweight: BMI between 27.1 and 29.9
  - Obese: BMI equal to or greater than 30.0

Based on this analysis, we can create a dictionary with typical BMXBMI values for each target class:

```json
{
	"Adult": [20.5, 25.3, 27.8, 31.2, 35.6],
	"Senior": [23.7, 26.4, 29.1, 32.7, 37.9]
}
```

Please note that these values are just examples and may not reflect the actual data.