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Re: 70 75 80 85 90 105 105 130 130 130 The list shown consist of [#permalink] New post 04 Jan 2013, 04:53
Bunuel wrote:
mainhoon wrote:
How many of the 10 running times are more than one SD below the mean.

So then 1SD below the mean is 77.6. It asks how many of the 10 running times are more than 77.6? I just replaced the one SD below the mean by the value. There are more than 2... What am I missing?


You have a problem with wording.

WRONG reading:
How many of the 10 running times are more than one SD below the mean. So more than Mean-SD.

CORRECT reading:
How many of the 10 running times are more than one SD below the mean. So less than Mean-SD.


I am still not getting this..
Why is it less and not more..
Please elaborate ..
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Re: 70 75 80 85 90 105 105 130 130 130 The list shown consist of [#permalink] New post 04 Jan 2013, 04:59
Expert's post
Sachin9 wrote:
Bunuel wrote:
mainhoon wrote:
How many of the 10 running times are more than one SD below the mean.

So then 1SD below the mean is 77.6. It asks how many of the 10 running times are more than 77.6? I just replaced the one SD below the mean by the value. There are more than 2... What am I missing?


You have a problem with wording.

WRONG reading:
How many of the 10 running times are more than one SD below the mean. So more than Mean-SD.

CORRECT reading:
How many of the 10 running times are more than one SD below the mean. So less than Mean-SD.


I am still not getting this..
Why is it less and not more..
Please elaborate ..


This is more verbal issue than math. In English the first reading is not correct while the second one is.
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Re: 70 75 80 85 90 105 105 130 130 130 The list shown consist of [#permalink] New post 04 Jan 2013, 08:13
Got it finally..
here: http://www.beatthegmat.com/beat-the-sta ... tml#548282
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Re: 70 75 80 85 90 105 105 130 130 130 The list shown consist of [#permalink] New post 19 Jun 2014, 03:49
Hello from the GMAT Club BumpBot!

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Re: 70 75 80 85 90 105 105 130 130 130 The list shown consist of [#permalink] New post 14 Aug 2014, 11:11
How many of the 10 running times are more than one SD below the mean.?

This is a pretty mean and twisted question, especially on GMAT because only one out of ten would be able to crack it under 2 mins.
To understand this question, draw or visualize the standard deviation-mean graph. Look at it this way:
How many of the running times are farther than one standard deviation below the mean? Another way of looking at it is, how many values lie towards the left of one standard deviation below the mean.

This is what the graph looks like : https://www.google.co.in/url?sa=i&rct=j ... 9705195344

Hope it is clear.
Re: 70 75 80 85 90 105 105 130 130 130 The list shown consist of   [#permalink] 14 Aug 2014, 11:11
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