1. (20 pts) Given the dataset with 2 variables X and Y: The red circles are negative classes, and the blue triangles are positive classes. Build a decision tree that classifies the dataset. (Note: Hand computing please) 0.9 0.8 0.7 0.6 Y 0.5 0.4 0.3 0.2 0.1 O 1 O T 1 O D D 0.1 0.2 0.3 0.4 0.5 X 0.6 0.7 0.8 D 0.9 1