Air Canada, WestJet, and Transat A$.$T$.$ Inc. announced purchases of planes on July $18(18/7),$ February $12(12/2),$ and October $7(7/10),$

respectively. Given the following information, calculate the CAR for these stocks as a group. Graph the result and provide an

explanation. All of the stocks have a beta of $1,$ and no other announcements are made. $($Round the answers $($including those for

intermediate calculations$)$ to $1$ decimal place. Negative values should be indicated by a minus sign. Leave no cell blank $-$ Be sure

to enter $"0"$ wherever required.$)$