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The median and mean of set S={3,8,-1,7,4} can be made equal by includi

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Joined: 23 Feb 2015
Posts: 1887
The median and mean of set S={3,8,-1,7,4} can be made equal by includi  [#permalink]

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06 Aug 2019, 07:32
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65% (hard)

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55% (02:50) correct 45% (02:16) wrong based on 20 sessions

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The median and mean of set $$S={3,8,-1,7,4}$$ can be made equal by including which of the following numbers to $$S$$?
A) 9
B) -2
C) -3
D) 12
E) 3
Senior Manager
Joined: 28 Jun 2019
Posts: 469
The median and mean of set S={3,8,-1,7,4} can be made equal by includi  [#permalink]

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06 Aug 2019, 09:03
First we have to arrange numbers consecutive -1,3,4,7,8
Mean = 21/5
Median 4
If we add number 12, we will have
-1,3,4,7,8,12
Mean= 33/6=5.5
Median=4+7/2=5.5
Option D

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The median and mean of set S={3,8,-1,7,4} can be made equal by includi   [#permalink] 06 Aug 2019, 09:03