Given the following utility matrix, representing the ratings, ona 1–5 star scale, of eight items, a through h, by three users A, B,and C:
| a | b | c | d | e | f | g | h |
| A | 4 | 5 | | 5 | 1 | | 3 | 2 |
| B | | 3 | 4 | 3 | 1 | 2 | 1 | |
| C | 2 | | 1 | 3 | | 4 | 5 | 3 |
After we normalize the matrix by subtracting from each nonblankentry the average value for its user, what is the cosine distancebetween users A and C ?
| | -0.1155 |
| | 0.5842 |
| | 0.3334 |
| | -0.7396 |
