Please help me answer this question, attached is the screenshot. I have the problem half worked.

Ross 00., Westereld, Inc.. and Jordan Company announced a new agreement to market their respective products in China on July 18 (7/18). February 12 (2112), and October 7 (1017), respectively. Given the information below, calculate the cumulative abnormal return (CAR) for these stocks as a group. Assume all companies have an expected return equal to the market return. (Negative amounts should be indicated by a minus sign. Leave no cells blank - be certain to enter \"0" wherever required. Round your answers for all columns to 1 decimal place.) 7112 0.5 0.6 213 0.5 0.3 1011 2 0.3 7113 1.3 0.3 219 0.3 0.3 1012 1.9 0.3 7113 0.2 0.3 2110 0.3 0.6 1013 0.3 1.3 7117 -D.6 -0.2 2111 0.5 2.7 10I6 -0.1 -0.5 7113 0.2 1.3 2112 0.1 0.1 1017 -1.6 0.5 7119 -2.5 0.1 2115 1.3 1.9 1013 1.3 0.4 7120 0.9 0.9 2113 0.7 0.3 1019 0.5 0.3 7123 0.3 0.4 2117 -0.1 0 10110 0.1 0.1 7124 1.3 0 2113 2.2 0.4 10113 0.5 0.3 -4 -.1 -.1 -1.2 .3 -15 0 .1.1 .2 .5 .3 0.7 .1 .4 2.2 ..4 0 1.5 .2 1.1 1 2.4 .6 -.9 2 0 .1 1.3 3 -.2 .1 -.2 4 -1.8 -1.8 -1