This is the 17099th most frequent Russian word.
средним
"Средним" means "average" or "medium" in English.
Here, "средним" is used in the instrumental case to denote the means or manner of achieving the average grade.
У меня средним баллом вышло пять.
My average score was five.
In this example, "средним" refers to a method or approach that is average or moderate and appears in the instrumental case.
Он решил задачу средним способом.
He solved the problem in an average manner.
"Средним" is used here to describe the quality or characteristic of the team's result, again in the instrumental case.