(13+17+18+12) ÷ 4, 60÷4, 42÷4, 13+17+18+3, 小明三科的平均分是88分, 他中文是88分,英文是88分,數學是, 87, 88, 89, 90, 小康三科的平均分是88分, 他中文是88分,英文是87分,數學是, 87, 88, 89, 90, 以下哪個不是計平均數的方法, 以少補多, 以多補少, 總和 ÷ 項數, 總和是 140,項數是 5 ,平均數等於, 15, 28, 19, 20, 黃信的平均分是90, 但他中英數三科的分數是 92 ,94,99分, 合理嗎, 合理, 不合理, 2.3+4.7+2.3+4.7+4.7+4.7+4.7 =, 2.3 x 2 + 4.7 x 5, 2.3 x 3 + 4.7 x 4, 2.3+4.7+2.3+4.7+4.7+4.7+4.7 , 項數有多少個?, 7, 5, 6, 4
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