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# A set has exactly five consecutive positive integers starti

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A set has exactly five consecutive positive integers starti [#permalink]  30 May 2018, 01:44
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Question Stats:

94% (01:04) correct 5% (00:41) wrong based on 17 sessions
A set has exactly five consecutive positive integers starting with 1. What is the percentage decrease in the average of the numbers when the greatest one of the numbers is removed from the set?

(A) 5

(B) 8.5

(C) 12.5

(D) 15.2

(E) 16.66
[Reveal] Spoiler: OA
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Joined: 07 Jun 2014
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GRE 1: Q167 V156
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Kudos [?]: 2971 [1] , given: 394

Re: A set has exactly five consecutive positive integers starti [#permalink]  31 May 2018, 06:53
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Expert's post
The set is {1,2,3,4,5}.

Average of the set is $$\frac{1+2+3+4+5}{5}=3$$.

When we remove 5 the largest number.

Average is $$1+2+3+4/4=2.5$$.

% reduction is $$\frac{3-2.5}{3}=\frac{0.5}{3}=16.666%$$.
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Re: A set has exactly five consecutive positive integers starti   [#permalink] 31 May 2018, 06:53
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