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Can't Recognize Shaded Regions, Help Please

Expert replies
by amirhakimi » Sat Nov 02, 2013 8:13 am
Where is shaded area here? Can someone guide me please?

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If the variables, X, Y, and Z take on only the values 10, 20, 30, 40, 50, 60, or 70 with frequencies indicated by the shaded regions above, for which of the frequency distributions is the mean equal to the median?

(A) X only
(8) Y only
(C) Z only
(D) X and Y
(E) X and Z
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Source: — Problem Solving |

by Brent@GMATPrepNow » Sat Nov 02, 2013 8:47 am
This incomplete question looks like a twist on this question: https://www.beatthegmat.com/ps-mean-and- ... 16119.html

You're right - the figures require shading.

Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
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by mevicks » Sat Nov 02, 2013 8:51 am
This is an old quant review question:

Image
If the variables, X, Y, and Z take on only the values 10, 20, 30, 40, 50, 60, or 70 with frequencies indicated by the shaded regions above, for which of the frequency distributions is the mean equal to the median?

(A) X only
(8) Y only
(C) Z only
(D) X and Y
(E) X and Z
Frequency Distribution for X : 10 20 20 30 30 30 40 40 40 40 50 50 50 60 60 70
Mean = 40 (All the same colored ones are multiples of 40 so mean would be evened out to 40)
Median (Mid) = (40 + 40)/2 = 40

Frequency Distribution for Z : Similarly for Z Mean = Median = 40

There's no answer option containing all the three so we need not check Y

[spoiler]Answer : E[/spoiler]
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