Averages are as follows:
A-Mei - 7.21429
Ayumi - 4
BoA - 7.42857
Elva - 4.21429
Hyori - 5.5
Jolin - 7.92857
Jung-Hwa - 2.92857
(Her highest score was a 7.5, and I gave her three 1s, nnn.)
Kumi - 5.92857
Namie - 7.21429
Utada - 7.35714
I also tried to be less liberal with my tens than I usually am, so I only gave out nine (one to Namie, one to Utada, three to Jolin, one to A-Mei, one to BoA, and two to Hyori).