How to find Entropy Information Gain | Gini Index Splitting Attribute Decision Tree by Mahesh Huddar

How to find Entropy, Information Gain, Gini Index, Splitting Attribute, Decision Tree, Machine Learning, Data Mining by Mahesh Huddar
Consider the training examples given in the table for binary classification,
1. What is the entropy of the whole collection of training examples.
2. What is the information gain of the attributes a1 and a2 with respect to the training examples.
3. Compute the Gini Index of the attributes a1 and a2.
4. Which is the best splitting attribute between a1 and a2.
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