For which of the following lists of 5 numbers is the average (arithmetic mean) less than the median?

Select answer A 3, 4, 9, 16, 17
Select answer B 1, 2, 9, 10, 11
Select answer C 7, 8, 9, 20, 22
Select answer D 5, 7, 9, 11, 15
Select answer E 3, 5, 9, 20, 21

Question

For which of the following lists of 5 numbers is the average (arithmetic mean) less than the median?

Select answer A 	3, 4, 9, 16, 17
Select answer B 	1, 2, 9, 10, 11
Select answer C 	7, 8, 9, 20, 22
Select answer D 	5, 7, 9, 11, 15
Select answer E 	3, 5, 9, 20, 21

zarkon · Answer

there is one obvious answer

zarkon · Answer

you don't even need to calculate the averages

zarkon · Answer

the median is 9 for all

for (B) 2 is farther from 9 than 10 is and 1 is farther fram 9 than 11 is .  Thus the mean must be less than 9