Why are there two clusters in figure 4? And what is the number of the outlier?

Create a dotplot for these data and point out any clusters or outliers. OOOOOOO OOOO OO 000000 0 8 01 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Fig. 1 Fig.2 DO OO QO QO OO OOOOOO 000800 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Fig.3 Fig.4 The correct dotplot is figure number 4 Number of clusters 2 Outlier i 3