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The results of a certain experiment included 6 data values

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The results of a certain experiment included 6 data values [#permalink] New post 23 Jun 2010, 11:30
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The results of a certain experiment included 6 data values that were all multiples of the same number c, namely, c, 8c, 2c, 5c, 4c, and 4c. Was the average (arithmetic mean) of the 6 data values greater than 8?

(1) c < 4
(2) c > 2
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Re: Need Solution for some DS problems from SET1 [#permalink] New post 23 Jun 2010, 14:31
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udaymathapati wrote:
I have problem in solving following DS questions from SET1 (I don't know the source of this). Can anyone help me in resolvign them?

DS Questions: Need help

Q21:
The results of a certain experiment included 6 data values that were all multiples of the same number c, namely, c, 8c, 2c, 5c, 4c, and 4c. Was the average (arithmetic mean) of the 6 data values greater than 8?
(1) c < 4
(2) c > 2


Average=\frac{sum \ of \ terms}{# \ of \ terms}=\frac{c+8c+2c+5c+4c+4c}{6}=4c. Question: is 4c>8? --> is c>2?

(1) c < 4. Not sufficient.
(2) c > 2. Sufficient.

Answer: B.
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Re: Need Solution for some DS problems from SET1 [#permalink] New post 23 Jun 2010, 14:49
udaymathapati wrote:
I have problem in solving following DS questions from SET1 (I don't know the source of this). Can anyone help me in resolvign them?

DS Questions: Need help

Q21:
The results of a certain experiment included 6 data values that were all multiples of the same number c, namely, c, 8c, 2c, 5c, 4c, and 4c. Was the average (arithmetic mean) of the 6 data values greater than 8?
(1) c < 4
(2) c > 2



I want to advice you. Please do not get me wrong, this was an easy question. On real Gmat you will face tricky DS quant questions. I think you need to brush up your quant concepts using MGMAT guides, especially Number properties. Its good to build concepts first. After that start practicing.
I wish you good luck.
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Re: Need Solution for some DS problems from SET1   [#permalink] 23 Jun 2010, 14:49
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