K-Means clustering is performed on the bank.arff data file in Weka. The file is opened and SimpleKMeans clustering is selected from the Cluster menu. The number of clusters is configured by clicking the text box next to the "Choose" button, which brings up a pop-up window to specify the number of clusters.

1. K-Means cluster in Weka

2. • Weka Explorer  Open file  bank.arff

3. • Cluster  Choose button 
SimpleKMeans  Next, click on the text
box to the right of the "Choose" button to
get the pop-up window.