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Master | Next Rank: 500 Posts
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by mlane25269 » Sat Jul 05, 2008 9:46 am
Hi guys!

How do I solve? Thanks!
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by smashinonions » Sat Jul 05, 2008 10:05 am
is it 6 and 6 ??
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by ildude02 » Sat Jul 05, 2008 4:40 pm
The answer is E, since the pair 6, 6 both are the avg values and would not change the average and also the variance = (each value - mean) ^ 2 for the new values will be 0. But the num of data incresed from 100 to 102, so the SD which is
SQRT(sum of variance of each individual element/num of elements) will now be less then before.

Any easier way of getting to the answer?
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by mlane25269 » Sat Jul 05, 2008 9:26 pm
I hope there is an easier way because I sure am confused on this one. I had thought that standard deviation was rarely tested on the GMAT and yet the GMATprep has about 3 or 4 standard deviation questions??
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by rs2010 » Sun Jul 06, 2008 9:50 am
What ever is written by ildude02 is correct.
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