The regression tree shown below predicts people's income by using their education level (educ), work class level (workclass), age (age), and happiness level (happy).

Question: Fill in the blank

From the regression tree, there is [ blank ] Options: ["4%", "5%", "2%", "10%", "49%", "11%", "19%"] of original data whose age is younger than 22, and their predicted income will be [ blank ] Options ["0.52", "1.3", "2.3", "2", "2.5", "2.7", "3.1"] .