a. What was the ariahmetic average retarn on Pegina's stock over thit five-year period? (Round the finnt answer to 1 deelmal place) Average retum b-1. What was the virfance of Regina's returns over tilis period? (Do not round intermediote colculations. Round the finsl naswer to 5 decimel plinces.) Varlance b-2. What was the standord deviotion of Regina's retians over this period? (Do not round intermedinte caleuiletiben. Aound the finel answer to 1 decimal ploce.) Standard deviation