A telecommunications company wants to identify customers who are likely to unsubscribe to the telephone service. The company collects the following information from 100 customers: customer ID (ID), age (Age), annual income (Income), monthly usage (Usage, in minutes), tenure (Tenure, in months), and whether the customer has unsubscribed to the telephone service (Unsubscribe). A portion of the data set is shown in the accompanying table.

a. Perform k-means clustering to group the 100 customers into four clusters based on age, income, monthly usage, and tenure. Describe the characteristics of each cluster. 

b. Compute the percent of customers that have unsubscribed to the telephone service from each cluster. Which cluster has the highest percent of customers who have unsubscribed to the telephone service?

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ID Age Income Usage Tenure Unsubscribe 1 33 49156 154 43 1 2 35 23538 107 12 1 I I E ⠀ 100 46 44018 192 1 *** ⠀ 23