Prove the following statement For each cluster Cj and its representative zj (j 1, 2, , k), the cost function can be written as cost( ) cost( mean()) mean() 2

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Prove the following statement  For each cluster Cj and its representative zj (j   1, 2,    , k), the cost function can be written as  cost( ) cost( mean())      mean()  2

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Question: Prove the following statement: For each cluster Cj and its representative zj (j = 1, 2, ..., k), the cost function can be written as:

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