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Std deviation gmat prep

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Std deviation gmat prep [#permalink] New post 07 Dec 2006, 00:47
need some explanation on this guys...do help...i am getting 5 thgh the OA is 2...

Cheers!!
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 [#permalink] New post 07 Dec 2006, 01:12
100-22,4=77.6

Only two values are below......
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 [#permalink] New post 07 Dec 2006, 04:42
Also 2 for me.

I nearly got caught out, did you get 5 by including what is above as well!
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 [#permalink] New post 07 Dec 2006, 10:56
Could anyone help me out in finding a link which could brush my basic on Standard Deviation.
:P
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 [#permalink] New post 07 Dec 2006, 15:05
You dont really need to worry about how the standard deviation is calculated.

Basically:

1) Find the mean of a set of numbers
2) Find the difference between each of the numbers and the mean
3) Square the differences and add them together
4) Take the positive square root of this value.

For this question you just need to find the mean = sum of all numbers/no. in set = 1000/10 = 100

100 - 22.4 = 77.6

The question asks how many of the values are below 77.6

= 2
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 [#permalink] New post 07 Dec 2006, 19:52
I have a problem understanding the question.


how many of them are more than 1 sigma below mean :shock:

1 sigma below mean = 77.6 ok
MORE than 77.6 , there are eight of them!
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 [#permalink] New post 08 Dec 2006, 17:26
Only 70 and 75 are less than 77.6 (or more than one standard deviation below the mean.)
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 [#permalink] New post 09 Dec 2006, 07:48
Explanation as above - 2 is the answer
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Re: Std deviation gmat prep [#permalink] New post 10 Dec 2006, 01:59
mean = 100
one std dev below, 100 - 22.4 = 77.6

only 2 values 70,75 are below 77.6.
Re: Std deviation gmat prep   [#permalink] 10 Dec 2006, 01:59
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