听力原文:Yesterday, my roommate chewed me out. He said I always make a mess in the living room, and he is tired of cleaning up after me. What did the speaker's roommate do?
【单选题】The average (arithmetic mean) of 50 measurements is 34.6, and the least and the greatest of the measurements are 18.3 and 50.9, respectively. Column A Column B The median of the 50 measurements 34.6
A.
if the quantity in Column A is greater
B.
if the quantity in Column B is greater
C.
if the two quantity are equal
D.
if the relationship cannot be determined from the information given