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A set has exactly five consecutive positive integers startin

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A set has exactly five consecutive positive integers startin [#permalink] New post 14 Apr 2018, 02:28
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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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Re: A set has exactly five consecutive positive integers startin [#permalink] New post 16 Apr 2018, 21:39
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we are given, set of consecutive integers starting with \(1\) hence our set consists of:
{\(1,2,3,4,5\)}
avg of this set = \(\frac{1+2+3+4+5}{5} = \frac{15}{5} = 3\)
if the largest number is removed from the set the new set is {\(1,2,3,4\)} as \(5\) is removed
The avg of the new set is \(\frac{10}{4} = 2.5\)
\(%\)decrease \(= 3-2.5/3 * 100 =16.66%\)
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Re: A set has exactly five consecutive positive integers startin   [#permalink] 16 Apr 2018, 21:39
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A set has exactly five consecutive positive integers startin

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