First three data instances:
[5.1, 3.5, 1.4, 0.2, 'Iris-setosa']
[4.9, 3.0, 1.4, 0.2, 'Iris-setosa']
[4.7, 3.2, 1.3, 0.2, 'Iris-setosa']
25-th data instance:
[4.8, 3.4, 1.9, 0.2, 'Iris-setosa']
Value of 'sepal width' for the first instance: 3.5
The 3rd value of the 25th data instance: 1.9
