This is the 8568th most frequent Polish word.
przeciętna
"Przeciętna" in English means "average."
In this sentence, "przeciętna" describes the moderate, not outstanding quality of her school results.
Jej wyniki w szkole są tylko przeciętne.
Her school results are just average.
Here, "przeciętna" refers to the typical behavior or characteristics of an average housewife for comparison.
Jako przeciętna gospodyni domowa, robiła zakupy dwa razy w tygodniu.
As an average housewife, she shopped twice a week.
In this usage, "przeciętna" refers to the statistical mean value derived from a set of data.