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Source: — Data Sufficiency |

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by Brent@GMATPrepNow » Thu Jan 12, 2012 9:28 am
sud21 wrote:The average of some numbers is 43, what is the standard deviation?
1). The least number is 43
2). The greatest number is 43
Aside: I'm assuming here that "average" is the same as "mean average"

Statement 1:
If the smallest value is 43, AND the average is 43, then there can be no values greater than 43.
So, the set consists solely of 43's, in which case the SD = 0
SUFFICIENT

Statement 2:
If the biggest value is 43, AND the average is 43, then there can be no values less than 43.
So, the set consists solely of 43's, in which case the SD = 0
SUFFICIENT

Answer = D

Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
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