四分位差公式!!!有很多人会错的

qd formulae

 

自己找题目来做!!!!

比如 :    求  12,10,13,9,14,15,6,17 的四分位差。

答案 :        Q3 是14.5 ,    Q1 是 9.5

所以    QD=(14.5-9.5)/2 = 2.5

 

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