诚心请教math prep一道题

snowofjune

Last month 15 homes were sold in Town X. The average (arithmetic mean) sales price of the homes was $150,000 and the median sales 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 one of the homes was sold for less than $130,000

A. I only

B. II only

C. III only

D. I and II

E. I and III

The answer is A. I chose C.

Another quick question, 负数的零次方也等于1吗？多谢指点。

snowofjune

Thanks a lot!!!

snowofjune

I was wrong at the beginning of solving this problem, I took it too easy, did not even have those numbers write down to calculate. Thanks for the detail explaination.