Artificial turf on athletic fields was first introduced in the 1960’s. it’s safety has been controversial since then. one issue that has been investigated is wether injuries of football players tend to be more serious on artificial turf instead of grass. a study followed 24 ncaa division 1a college teams over 3 seasons. in total, there were 1,050 injuries that occurred on field turf. of the field turf injuries, 83.3333% were minor, and 10.857% were substantial. 77.972% of grass injuries were minor. 4.26% of injuries occurred on grass and were severe. how many injuries were severe and occurred on field turf? how many injuries were severe?