9.At some step of k-means clustering, the following intermediary clusters are obtained: 4 5 6 8 13 15

Complete the analysis and find the final clusters.

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11.We have the ratings of 4 users on 4 items :

A: ( 10, 3, 9, - )

B: ( -, 9, 6, 2 )

C: ( 1, 7, - , 3 )

D: ( 8 , 2 ,- , - )

A new user E has the following ratings : What should be the recommendation for user E ?

E < 9, - ,- , - >

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12.

b)Suppose there are N users and P items. Discuss the complexity of matrix

operations for collaborative filtering. .