Table: chargers_2002
Columns: week
date
opponent
result
attendance

Question: What is the sum of Week when there were 67,968 people in attendance?
SQL: SELECT SUM("week") FROM chargers_2002 WHERE "attendance" = '67,968'

Question: What is the Week number with a result of l 31–28?
SQL: SELECT COUNT("week") FROM chargers_2002 WHERE "result" = 'l 31–28'