Sounds funny doesn't it?! Well decision trees are tools used by people to help them make confident decisions. It helps them layout several alternatives in a tree-like format. They can see most, if not all, the decisions available and can even set a rating on each choice.
The concept of a decision tree is an extension of a mind map. A mind map lets you create ideas and connections to those ideas. The decision tree is much like this concept except for a decision tree there is a score added to the branches of the tree.
These scores often represent probabilities. If you have three choices, you may assign two branches with 40% probabilities, and the third branch would receive a 20% probability. The total of the branches should add up to 100%. However, it is your decision tree, so you are free to use whatever allocations you like if any. If your system makes sense to you, then it is correct.
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