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∵樣本x1、x2、…、xn的方差為2,又∵一組數據中的各個數據都擴大幾倍,則新數據的方差擴大其平方倍,∴樣本3x1、3x2、…、3xn的方差為32×2=18,∵一組數據中的各個數據都加上同一個數後得到的新數據的方差與原數據…
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