For the 5 days shown in the graph, how many kilowatt-hours greater was the median daily electricity use than the average (arithmetic mean) daily electricity use?
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5
考察中位数和算数平均数的题目:
先将5个数值顺序排列:19,24,27,29,31 得中位数为27
算数平均数为:(19+24+27+29+31)/5=26
题目问:电日用量的中位数比平均数大多少,则27-26=1 。
答案是A。
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求图.....