Three boxes of supplies have an average weight of 7 kilograms and a median weght of 9 kilograms. What is the maximum possible weight, in kilograms, of the lightest box? A. 1 B. 2 C. 3 D. 4 E. 5 我错选了B。 答案是C。 归纳一下,其实我的问题就是:3,9,9 这三个数的中位数怎么算??? 谢谢好心人解答。这就是Practice1 里面的题,刚做完。数学错了6道,唉!