像讨论稿里给出的这道类似的题(Prep的): “Last month 15 homes were sold in Town X. The arithmetic mean sale price of the homes is $150,000 and the median price was $130,000. Which of the following statements must be true?
I. At least one of the homes was sold for more than $165,000 II. At least one of the homes was sold for more than $130,000 and less than $150,000 III. At least oe of the homes was sold for less than $130,000.“