Problem 7.5 Cumulative Abnormal Returns (LO2, CFA2) Ross Co. Westerfield Inc, and Jordan Company announced a new agreement to maiket their respective products in China on July 18 . February 12 and October 7, respectively. Given the information below, calculate the cumulative abnormal return (CAR) for these stocks as a group. Assume all companies have an expected retum equal to the market return (A negotive value should be indicated by o minus sign. Leave no cells blank - be certain to enter " O " wherever required. Do not round intermediate calculations. Round your onswers to one decimal place.)