I cannot seem to get the correct answer

Delta, United, and American Airlines announced purchases of planes on July 18 (7/18), February 12 (2/12), and October 7 (10/7), respectively. Delta Market Company Market Company Market Company Date Return Return 7/12 7/13 7/16 7/17-57 718 -2.14 7/19 -89 Date Return Return Date Return Return 10/1 -49 .25 85 -.29 1.26 -.61 7/20 -.94-1.12 -.84 -.94 -.35 1.15 15 1.15 -1.38 2/10 1.90 -.06 2/12-35 2/15 1.15 2/16 10/6 07 -2.25 10/8 10/9 10/10 10/13 -.35 75 .25 -.07 08 16 Given the above information, calculate the cumulative abnormal return (CAR) for these stodks as a group A negative answer should be indicated by a minus sign. Leave no cells blank be certain to enter "0" wherever required. Do not round intermediate calculations and round your answers to 2 decimal places, e.g., 32.16.) Abnormal returns (Ri - RM Average abnormal Cumulative Delta United American abnormal return 24 3.56 3.84 3.42 1.97 5.54 1.81 13 2 13 .78 -.24 -.27 Delta, United, and American Airlines announced purchases of planes on July 18 (7/18), February 12 (2/12), and October 7 (10/7), respectively. Delta Market Company Market Company Market Company Date Return Return 7/12 7/13 7/16 7/17-57 718 -2.14 7/19 -89 Date Return Return Date Return Return 10/1 -49 .25 85 -.29 1.26 -.61 7/20 -.94-1.12 -.84 -.94 -.35 1.15 15 1.15 -1.38 2/10 1.90 -.06 2/12-35 2/15 1.15 2/16 10/6 07 -2.25 10/8 10/9 10/10 10/13 -.35 75 .25 -.07 08 16 Given the above information, calculate the cumulative abnormal return (CAR) for these stodks as a group A negative answer should be indicated by a minus sign. Leave no cells blank be certain to enter "0" wherever required. Do not round intermediate calculations and round your answers to 2 decimal places, e.g., 32.16.) Abnormal returns (Ri - RM Average abnormal Cumulative Delta United American abnormal return 24 3.56 3.84 3.42 1.97 5.54 1.81 13 2 13 .78 -.24 -.27