Table:
text: Gymnastics at the 2008 Summer Olympics – Men's floor
Qualified competitors
Qualified competitors
Position_ Gymnast A_Score B_Score Total
1st Diego Hypólito ( BRA ) 6.600 9.350 15.950
2nd Marian Drăgulescu ( ROU ) 6.900 9.025 15.925
3rd Gervasio Deferr ( ESP ) 6.500 9.325 15.825
4th Fabian Hambuechen ( GER ) 6.500 9.300 15.800
5th Kōhei Uchimura ( JPN ) 6.500 9.225 15.725
6th Zou Kai ( CHN ) 6.700 9.100 15.700
7th Anton Golotsutskov ( RUS ) 6.500 9.100 15.600
8th Alexandr Shatilov ( ISR ) 6.600 9.000 15.600

Question: What is the average b-value when the gymnast is kōhei uchimura (jpn) from Gymnastics at the Summer Olympics 2008 - Men's Floor?

Question: What is the b grade if the a grade is 6.9 in 2008 Summer Olympics Gymnastics - Men's Floor?

Question: What is the sum of the b grade if the a grade is 6.6 and the overall grade is 15.6 for Gymnastics at the 2008 Summer Olympics - Men's Floor?