prep数学求助！！！！就急急急

2406032466

Last month 15 homes were sold in Town X.The average sale price of the homes was 150,000 and the median price is 130,000,what the following statement must be true?

i.at least one of the homes was sold for more than165,000
ii.at least one of the homes was sold more than 150,000
iii.at least one of the homes was sold less than 130,000
不懂完全不懂啊啊啊啊啊啊啊要死了错了13个prep

suellen6780

我试着解释一下,假如没有房子的售价超过165k,那么所有的房子总价最多是130*7+130+7*165=2195k,小于15套房子的总价2250k.所以至少有一套房子超过165k.
我也错了,倒推的.真正考试碰上的话估计想不了这么多了.