采用下面的数据进行聚类分析:
x1 x2
-0.5200 1.8539
2.5849 2.2481
0.9919 1.9234
2.9443 3.7382
-0.4240 3.6220
1.7762 2.6264
2.0581 2.0918
1.5754 1.1924
1.7971 1.5387
0.4869 0.5940
7.8736 7.6255
8.1850 7.5291
9.3666 9.7513
8.4139 8.7532
10.5374 8.0650
9.1401 7.7072
7.1372 8.0828
8.5458 8.7662