I figured out how to calculate a. b. and c. however, I don't know how to interpret the coefficient of determination(the second part of c). Can anyone help? Thanks in advance.
$\displaystyle r^2 $ gives the variation of $\displaystyle Y $ explained by the linear regression model. So in 1c, $\displaystyle 7 \% $ of the variation in the net worth is explained by the linear regression model. Similarly, in 2c, $\displaystyle 57.76 \% $ of the variation in the salary is explained by the linear regression model.