Question: What was the attendance for the game that has a tie number of 13?
SQL: SELECT SUM("Attendance") FROM "2-11647944-3" WHERE "Tie no" = '13';

Question: What is the average attendance when the Forest Green Rovers is the away team?
SQL: SELECT AVG("Attendance") FROM "2-11647944-3" WHERE "Away team" = 'Forest Green Rovers';