아니래
https://math.stackexchange.com/questions/3331917/proof-that-the-sample-mean-is-the-best-estimator-for-the-population-mean
ㄷㄷ ㄱㅅㄱㅅ
아니래
https://math.stackexchange.com/questions/3331917/proof-that-the-sample-mean-is-the-best-estimator-for-the-population-mean
ㄷㄷ ㄱㅅㄱㅅ