The highest mark and the lowest will be abandoned and the average mark will be counted as the final result of the contestant.

去掉一个最高分，去掉一个最低分，最后的平均分为选手的比赛成绩。

youdao

From about 2000 entries, representing 450 schools, the average mark was 25%.

BBC: Past science papers stump pupils

When I graduated "Top Girl" in my class, I received awards in all manner of sports, academics and arts--and a very average mark in math.

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The average mark for the questions from the 1960s was 15%, and for each subsequent decade, this rose steadily, reaching 36% for the 2000s, the RSC said.

BBC: Past science papers stump pupils