About machine learning -supervised learning

this answer is 1. D 2. B

Could you explain in detail?

Thank you

1. Consider the following 1D dataset where the first element (numeric) in each pair represents the attribute

(a.k.a feature) and the second element (string) is the class label:

[(0.8, `Montreal'), (0.85, `Toronto'), (0.9, `Toronto'), (1, `Montreal'), (1.5, `Montreal')]

What is the entropy of this dataset?

A. 0.37

B. 0.47

C. 0.57

D. 0.67

E. 0.77

2. What is the Gini index of this dataset?

A. 0.378

B. 0.48

C. 0.58

D. 0.68

E. 0.78