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加权平均值是一个更准确的分数度量,能体现相对重要性。加权平均值往往用于投资组合,等级评分和其他统计数据。你可以在此了解如何计算加权平均值。
步骤
小提示
- 你可以加权平均值公式里代入一个变量来算出为了达到你的目标总分,你需要在某次考试里得多少分。例如,上面的例子里你想知道要取得总分为百分之80的成绩,你需要在后一个权重值为0.25的部分得几分,写出0.9(0.25) + 0.75(0.50) + x(0.25)=0.80。解出x=0.80。你需要在这部分得到一个百分之80的成绩,以使你的总分为百分之80。
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警告
- 加权平均值和平均值是不相同的。如果你取百分之90,75和87的平均值,答案是百分之84。权重分别为百分之25,50和25时,这个答案就不正确了。正确答案的应该是百分之81.75。
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