I just did it this morning. OA is A and I got it right.
but I gotta say it is one of the toughest questions in the real exam environment.
1). to evaluate A.
Since it says at least one of them must be over 165000, you should try to make a case in which there is none over 165000. i.e. find the extreme case in which all are below this amount. try to make the highest price below it.
Case: make those lower than the median be the highest at 130000.
then get the sum of those higher than 130000:
150000*15 - 130000*8
then find the average of those above the median. divide the above by 7:
you get roughly 175000(calculate it yourself). so the average is even over 165000. then there must be at least one over 175000 among those above the median.
And this is an extreme case. so overall, there is at least one.
2). II is wrong.
because in the case above, u can have 8 homes at the media price. and the rest at the average price of about 175000.
3). wrong. in the above case, none is less than 130000.