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# Is the average (arithmetic mean) of 5 different positive

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VP
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Is the average (arithmetic mean) of 5 different positive [#permalink]  10 Mar 2008, 22:12
Is the average (arithmetic mean) of 5 different positive integers at least 30?

(1) Each of the integers is a multiple of 10.
(2) The sum of the five integers is 160.
Director
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Re: stat gmatprep [#permalink]  11 Mar 2008, 01:40
Is it B

We need the sum and number of numbers to compute the mean

thus B alone is sufficient
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VP
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Re: stat gmatprep [#permalink]  11 Mar 2008, 08:29
B

Although A would work too if you do not count 0 as a multiple. But from my understanding it is a multiple.
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Re: stat gmatprep [#permalink]  14 Mar 2008, 08:13
terp26 wrote:
B

Although A would work too if you do not count 0 as a multiple. But from my understanding it is a multiple.

can't figure it out but also 1 is suff and oa is d, source gmatprep. Is it a mistake?
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Re: stat gmatprep [#permalink]  14 Mar 2008, 14:36
Nope, because it mentions POSITIVE integer (0 not included) so D
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Re: stat gmatprep [#permalink]  16 Mar 2008, 04:30
hmmm

Yes D it should be..

taking the 10,20,30,40,50( the smallest multiples of 10) -> 150/5 =30
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Re: stat gmatprep [#permalink]  19 Mar 2008, 18:41
I knew it was D...If it seems to simple it has to be a gmat trick. A is suff because the question is ATLEAST 30. So the minimum it could be is 10,20,30,40,50...which would give us 30. So yes, suff. Pick any other 5 multiples of 10 and it will always be greater than 30. thats why its suff.
Re: stat gmatprep   [#permalink] 19 Mar 2008, 18:41
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# Is the average (arithmetic mean) of 5 different positive

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