2. Consider a dataset X consisting of seven points: X = {1,2,4,8, 13, 16, 18.5}. (b) Perform hierarchical agglomerative clustering on the above dataset X, with single link- age. Draw the dendrogram by hand. Annotate the dendrogram to clearly label the heights of all joins. Draw a cut through the dendrogram to separate the data into three clusters. Your answer should be a picture of the dendrogram. [5 marks]