[经] weighted arithmetic average, weighted arithmetic mean
jiā quán suàn shù píng jūn shù ㄐㄧㄚ ㄑㄩㄢˊ ㄙㄨㄢˋ ㄕㄨˋ ㄆㄧㄥˊ ㄐㄩㄣ ㄕㄨˋ