[求助]天山9--3

虚无飘渺

each of the 45 boxes on the self J weighs less than each of the 44

boxes on the self K.what is the median weight of the 89 boxes on

these shelves?

<1>the heaviest box on the self J weights 15pounds

<2>the lightest box on the self K weighs 20 pounds

答案是A 可是偶觉得应该选E, 有谁帮我解释一下,谢谢

windfalls

89个数的median是从大到小排序后的第45个数，也就是较轻那堆里最重的那个，和较重那堆没关系。