Question

In: Advanced Math

Given the following utility matrix, representing the ratings, on a 1–5 star scale, of eight items,...

Given the following utility matrix, representing the ratings, on a 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 nonblank entry the average value for its user, what is the cosine distance between users A and C ?

-0.1155

0.5842

0.3334

-0.7396

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