An outbreak of salmonellosis occurred after a department luncheon, which was attended by 485 faculty/staff. Assume everyone ate the same...

An outbreak of salmonellosis occurred after a department luncheon, which was attended by 485 faculty/staff. Assume everyone ate the same food items. Sixty-five people had fever and diarrhea, 5 of these people were severely affected. Subsequent laboratory tests on all who attended the luncheon revealed an additional 72 cases. The attack rate of salmonellosis was