(35+39+42)/3=38.7
35*0.4/1.3+39*0.6/1.3+42*0.3/1.3=10.77+18+9.7=38.5
50.三組數據和權重值(Wi),分別為35(Wi:0.4)、39(Wi:0.6)..-阿摩線上測驗
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