Table 5. Average Distances Within Clusters

No. of Observations (Customers) Average Distance Between Observations in Cluster (Within-Cluster Distance)

Cluster 1 15 0.9

Cluster 2 10 1.4

Cluster 3 9 0.5

Cluster 4 12 1.1

Table 6. Average Distances Between Clusters (Between-Cluster Distance)

Cluster 1 Cluster 2 Cluster 3 Cluster 4

Cluster 1 0.00 1.30 2.00 1.50

Cluster 2 1.30 0.00 2.00 1.10

Cluster 3 2.00 2.00 0.00 1.20

Cluster 4 1.50 1.10 1.20 0.00

For each cluster (1-4) calculate the ratio of average between-cluster distance to average within-cluster distance.