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Set S contains seven distinct integers. The median of set S [#permalink]
19 Sep 2010, 11:37

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Question Stats:

38% (02:24) correct
62% (01:15) wrong based on 234 sessions

Set S contains seven distinct integers. The median of set S is the integer m, and all values in set S are equal to or less than 2m. What is the highest possible average (arithmetic mean) of all values in set S ?

Re: Highest possible all values in set S [#permalink]
19 Sep 2010, 11:48

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Orange08 wrote:

Set S contains seven distinct integers. The median of set S is the integer m, and all values in set S are equal to or less than 2m. What is the highest possible average (arithmetic mean) of all values in set S ? a) m b) 10m/7 c) 10m/7 – 9/7 d) 5m/7 + 3/7 e) 5m

If a set has odd number of terms the median of a set is the middle number when arranged in ascending or descending order; If a set has even number of terms the median of a set is the average of the two middle terms when arranged in ascending or descending order.

So median of S, which contains seven terms is 4th term when arranged in ascending order;: \(median=4th \ term=m\).

Now, to maximize the mean we should maximize the terms. As numbers in S are distinct integers and the highest number in S could be equal to \(2m\), then maximum values of the terms would be: \(m-3\), \(m-2\), \(m-1\), \(median=m\), \(2m-2\), \(2m-1\), \(2m\).

Re: Set S contains seven distinct integers. The median of set S [#permalink]
02 Dec 2013, 13:37

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Re: Set S contains seven distinct integers. The median of set S [#permalink]
12 Mar 2015, 02:30

Orange08 wrote:

Set S contains seven distinct integers. The median of set S is the integer m, and all values in set S are equal to or less than 2m. What is the highest possible average (arithmetic mean) of all values in set S ?

Re: Set S contains seven distinct integers. The median of set S [#permalink]
13 Mar 2015, 02:27

Orange08 wrote:

Set S contains seven distinct integers. The median of set S is the integer m, and all values in set S are equal to or less than 2m. What is the highest possible average (arithmetic mean) of all values in set S ?

A. m B. 10m/7 C. 10m/7 – 9/7 D. 5m/7 + 3/7 E. 5m

just assume m = 7 (median)

now since each term is distinct and max is 2m, to achieve max sum ... terms should be 4,5,6,7,12,13,14 mean = 61/7

by options, C is satisfied. so C. _________________

Illegitimi non carborundum.

gmatclubot

Re: Set S contains seven distinct integers. The median of set S
[#permalink]
13 Mar 2015, 02:27

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