This is the 4372nd most frequent Korean word.
평균보다
"평균보다" means "more than the average" or "above the average."
Here, '평균보다' is used to establish a comparison, indicating a value (his grades) exceeding the average.
그의 성적은 평균보다 높다.
His grades are higher than average.
In this context, '평균보다' is utilized in a similar comparative manner, indicating that the sales amount is below the average value.
이번 달 매출은 평균보다 낮다.
This month's sales are lower than average.
Here, '평균보다' is used to describe the speed at which someone solved a problem relative to the average time taken, emphasizing efficiency.