The arithmetic mean is Ulli Lohrmann and his wife, Suzanne Lohrmann, are planning for retirement and want to compare the past performance of a few mutual funds they are con- sidering for investment. They believe that a comparison over a five-year period would be appropriate. They are given the following information about the Rhein Valley Superior Fund that they are considering. Assets Under Management at Year the Beginning of Year (0) Net Return (%) 30 million 45 million 1 2 15 -5 10 3 20 million 4 25 million 35 million 5 0 6.70% 07.98% 08.98% 07.60%