What is the average (arithmetic mean) of eleven consecutive : GMAT Data Sufficiency (DS)
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What is the average (arithmetic mean) of eleven consecutive

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What is the average (arithmetic mean) of eleven consecutive [#permalink]

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New post 25 Jan 2008, 10:44
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What is the average (arithmetic mean) of eleven consecutive integers?

(1) The average of the first nine integers is 7.
(2) The average of the last nine integers is 9.
[Reveal] Spoiler: OA

Last edited by Bunuel on 08 Mar 2013, 04:59, edited 2 times in total.
Edited the question and added the OA.
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Re: DS: Average of 11 integers [#permalink]

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New post 25 Jan 2008, 12:03
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1) The average of the first 9 integers is 7
2) The average of the last 9 integers is 9

1) since the numbers are consequtive, the average of 9 numbers would be the same as the median.
Therefore the 5th number in the sequence is 7

The sequence would be 3,4,5,6,7,8,9,10,11 .. the next two numbers would obviously be 12 and 13

Sufficient

2) since the numbers are consequtive, the average of 9 numbers would be the same as the median.
Therefore the 7th number in the sequence is 9
The sequence would be 5,6,7,8,9,10,11,12,13 .. the next two numbers would obviously be 3 and 4

Sufficient

Answer would be D
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Re: If 11 consecutive integers are listed from least to [#permalink]

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New post 08 Mar 2013, 04:51
so its not possible to have a list of numbers with positive and negative numbers?
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Re: If 11 consecutive integers are listed from least to [#permalink]

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New post 08 Mar 2013, 05:02
fozzzy wrote:
What is the average (arithmetic mean) of eleven consecutive integers?

(1) The average of the first nine integers is 7.
(2) The average of the last nine integers is 9.

so its not possible to have a list of numbers with positive and negative numbers?


How it is possible? From both statements it follows that the set is {3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13}.
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Re: What is the average (arithmetic mean) of eleven consecutive [#permalink]

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New post 25 Oct 2016, 13:21
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Re: What is the average (arithmetic mean) of eleven consecutive   [#permalink] 25 Oct 2016, 13:21
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