SECTION B: QUANTITATIVE QUESTIONS 1. There are 500 client records in the first sheet of the file Toy-Info which have shopped many special toys from an e-Business website. Each record includes data on types of product purchased (between 1-5), purchase amount ($), age, gender, marital status, whether the client has a membership and whether the customer has a discount card. A business analyst has applied the k-rneans clustering method on all seven variables. The analyst increased the number of clusters to recommend a proper value of k. The resultant tests for k=5 and k= shown in the following sheets of the file revealed the best It as IFS. a) Explain how the analyst found that k=6 is a proper number of clusters. Refer the relevant sheet name, table name and the values you compared. b) Describe all 6 clusters by their average characteristics