5. GMAT score and salary. U.S. News & World Report publishes the av- erage starting salary and the average GMAT score for MBA graduates at each of the top 80 ranked schools in the country. The data fit the following regression line nicely: Y = 288X - 111,408, where X is the av- erage GMAT score for students at a school and Y is the average starting salary plus bonus (in $) for graduates from that same school. nair (a) Estimate the average starting salary plus bonus for a school having an average GMAT of 700 points. (b) Give a managerial interpretation of the coefficient 288. (c) If you plug in the lowest possible GMAT score of 200 for X, you get $53,808. Explain what this number represents and what it being negative means here