(2) RISI (this question is tricky) (22 pts) Assume there are only three income groups, $42,000, $60,000, and $125,000 in a given city. There are 5 districts in the city, A, B, C, D, and E. Details are provided in the Table below. A B C D E whole city income population population population population population Population $35,000 10 50 20 100 60 240 $60,000 20 10 20 80 60 190 $125,000 50 40 40 40 70 240 total 80 100 80 220 190 670 1) What are the median incomes in each district and in the city as a whole? (7 pts) 2) Which districts are predominantly poor and predominantly poor, respectively? (7 pts) 3) Calculate the RISI (report 4 decimals, e.g., RISI=1.2345) (6 pts)