單項選擇題由64名超市顧客組成的隨機樣本顯示顧客的平均消費金額為43美元。假設(shè)該分布符合正態(tài)分布,且總體標準差為15美元,則總體平均值的90%的置信區(qū)間最接近于()

A、41.085~44.915
B、40.218~45.782
C、39.916~46.084


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