A housing dataset is stored as a matrix — one row per example, one column per feature:
| example | : size (100 sq ft) | : age (years) | : price (hundreds of thousands) |
|---|---|---|---|
| house 1 | 12 | 6 | 5 |
| house 2 | 18 | 5 | 7 |
| house 3 | 20 | 4 | 9 |
| house 4 | 26 | 5 | 7 |
What is the mean value of feature across the four examples?
Select all that apply.