The final cluster centers are computed as the mean for each variable within
each final cluster. The final cluster centers reflect
the characteristics of the typical case for each cluster.
Customers in cluster 1 tend to be big spenders who
purchase a lot of services.
Customers in cluster 2 tend to be moderate spenders who
purchase the "calling" services.
Customers in cluster 3 tend to spend very little and
do not purchase many services.