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16 Apr 2009, 08:35
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33% (00:00) correct
67%
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if m is the average (arithmetic mean) of the first 10 positive multiples of 5 and if M is the median of the first 10 positive multiples of 5, what is the value of M-m?
a. -5
b. 0
c. 5
d. 25
e. 27.5
according to the answer in OG, the first 10 positive multiples are 1,2,3, ...,8,9,10, but i think positive number could also be 1.1, 1.2 .... or some other number which bigger than 0.
the correct answer is e, but why? Thks a lot
a. -5
b. 0
c. 5
d. 25
e. 27.5
according to the answer in OG, the first 10 positive multiples are 1,2,3, ...,8,9,10, but i think positive number could also be 1.1, 1.2 .... or some other number which bigger than 0.
the correct answer is e, but why? Thks a lot
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
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16 Apr 2009, 09:22
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"MULTIPLE" by definition has to be resulted when multiplied by a an Integer.
For example, 10 is a multiple of 5 because when 5 is multiplied by 2, it results in 10.
In the same way, 5 x 1.5 = 7.5 doesn't imply that 7.5 is a multiple of 5 because 1.5 is not an integer.
The answer,
First 10 positive multiples of 5 are = 5,10,15,20,25,30,35,40,45,50.
Arithmetic mean would be = 5(1+2+3......9+10)/10 = 27.5
In the same way, Median = (25+30)/2 = 27.5
Thus, M-m = 0.
Official Answer as listed in OG 11 is B.
For example, 10 is a multiple of 5 because when 5 is multiplied by 2, it results in 10.
In the same way, 5 x 1.5 = 7.5 doesn't imply that 7.5 is a multiple of 5 because 1.5 is not an integer.
The answer,
First 10 positive multiples of 5 are = 5,10,15,20,25,30,35,40,45,50.
Arithmetic mean would be = 5(1+2+3......9+10)/10 = 27.5
In the same way, Median = (25+30)/2 = 27.5
Thus, M-m = 0.
Official Answer as listed in OG 11 is B.
--== Message from the GMAT Club Team ==--
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This discussion does not meet community quality standards. It has been retired.
If you would like to discuss this question please re-post it in the respective forum. Thank you!
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THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.
If you would like to discuss this question please re-post it in the respective forum. Thank you!
To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
20 Apr 2009, 07:57
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Goldenagle94,
catch your point.
thks a lot:)
catch your point.
thks a lot:)
