Using a Bagging = Bootstrap Aggregation method,

Suppose that several decision trees have been trained for regression.

• The first tree says "if x<1, then f(x) = 5. Otherwise f(x) = 10"
• The second tree says "if x<2, then f(x) = 7. Otherwise f(x) =11"
• The third tree says "if x<0, then f(x) = 6. Otherwise f(x)= 9"

Write down the piecewise function obtained by averaging these models. Is it a tree model?