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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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25 Jan 2008, 11:44
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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, 05:59, 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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25 Jan 2008, 13:03
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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

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Re: If 11 consecutive integers are listed from least to [#permalink]

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08 Mar 2013, 05:51
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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08 Mar 2013, 06:02
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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25 Oct 2016, 14:21
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: What is the average (arithmetic mean) of eleven consecutive   [#permalink] 25 Oct 2016, 14:21
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