Problem 7-5 Cumulative Abnormal Returns (LO2, CFA2) Ross Co., Westerfield, Inc., and Jordan Company announced a new agreement to market 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 return equal to the market return. (A negative value should be indicated by a minus sign. Leave no cells blank - be certain to enter "0" wherever required. Do not round intermediate calculations. Round your answers to one decimal place.)