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Director
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What do you think about this one [#permalink] New post 05 Apr 2007, 08:37
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
What do you think about this one? :P
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Senior Manager
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 [#permalink] New post 05 Apr 2007, 15:53
Answer is E. :)

Both X and Z have mean = median = 40.
Director
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 [#permalink] New post 05 Apr 2007, 22:12
Summer3 wrote:
Answer is E. :)

Both X and Z have mean = median = 40.


But how do we find mean in those graphs? :roll:
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 [#permalink] New post 06 Apr 2007, 12:41
For x...
10*(1 block)+20*(2 blocks)+30*(3 blocks)+40*(4 blocks)+50*(3 blocks)+60*(2 blocks)+70*(1 block)=

10+40+90+160+150+120+70=640

Divided by 16 total blocks = mean of 40

z is done the same way...
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 [#permalink] New post 06 Apr 2007, 16:37
Even if you just look at the graphs, X and Z show some symmetry. Mean is the centre point here.....so without adding up all the numbers just pinpoint the central block, which is 40 for both X and Z. Same with median here....
but Y does not show any symmetry.....so you can calculate mean and median here just to confirm if they are equal or not. :)
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 [#permalink] New post 08 Apr 2007, 03:26
I got X&Z.

I looked at the options first, there was none with 3, so I picked 2 to test, X&Z.

First I did X by multiplying out the blocks in my head, Z was 760, divided by 19 in total, a mean of 40, and the median is 40 (as there are the same # of blocks on the left & right side).

Then I tested X quickly, same thing, 640/16=40, median is 40.

Answer = E - X&Z.
  [#permalink] 08 Apr 2007, 03:26
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