Table:
text: 2002 Honda Indy 300
Race
Race
Driver Team Laps Time_Retired Grid
Mario Domínguez Herdez Competition 40 2:00:06.524 18
Patrick Carpentier Forsythe Racing 40 +2.2 secs 15
Paul Tracy Team Green 40 +2.5 secs 5
Kenny Bräck Chip Ganassi Racing 40 +2.7 secs 4
Tony Kanaan Mo Nunn Racing 40 +4.8 secs 3
Alex Tagliani Forsythe Racing 40 +7.8 secs 14
Dario Franchitti Team Green 40 +9.9 secs 8
Cristiano da Matta Newman-Haas Racing 40 +12.3 secs 1
Michael Andretti Team Green 40 +13.5 secs 16
Michel Jourdain, Jr. Team Rahal 40 +13.6 secs 12
Christian Fittipaldi Newman-Haas Racing 40 +14.8 secs 13
Jimmy Vasser Team Rahal 40 +16.2 secs 11

Question: What is the average starting grid for the 2002 Honda Indy 300 +2.2 seconds time/retirement?