In a lab, you run K-Means for K = 1 to 10 and plot WCSS (inertia) vs K. The plot shows a sharp decrease from K=1 to K=3, then only gradual decline from K=4 onward. What should you conclude?

Question

Answer

The elbow plot is unreliable; you must always use the silhouette score instead.

Answer

K=10 should be chosen since lower WCSS always implies better clustering.

Answer

K=3 is likely the optimal number of clusters because the elbow indicates diminishing returns beyond this point.

Answer

K=1 is best since the largest reduction occurs at the first step.

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In a lab, you run K-Means for K = 1 to 10 and plot WCSS (inertia) vs K. The plot...

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