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Standard dev gmatprep picture attached

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vimalshahmph
 Post subject: Standard dev gmatprep picture attached
 Post Posted: Sun Oct 25, 2009 1:39 am 
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Posts: 5
http://www.postimage.org/image.php?v=Ts1lWj0A

std dev problem...... it flew over my head.......


Last edited by vimalshahmph on Thu Nov 12, 2009 7:32 am, edited 1 time in total.

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RonPurewal
 Post subject: Re: STANDARD DEVIATION PROBLEM GMAT PREP SUM
 Post Posted: Wed Nov 11, 2009 7:39 am 
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ManhattanGMAT Staff


Posts: 6765
vimalshahmph wrote:
i have an image file i want to post in the forum . Please let me know how Can i do it.
the img button in the message body does not work or I dont know how to operate it.


you can use an external image-hosting web site, such as postimage.org, and then just put a link in your post.

that's the only way i know how to do it.
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vimalshahmph
 Post subject: Standard dev gmatprep picture attached
 Post Posted: Thu Nov 12, 2009 6:58 am 
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Posts: 5
http://www.postimage.org/image.php?v=Ts1lWj0A

this is the image for the question........i just marked the answer in a rush luckily i struck the right choice...........

if anyone can analyze what is going on........ last time I took the gmatprep i got two standard deviation programs and they were not to assess the spread from the mean , or adding the same factor or same number to a list and assess the change...
unfortunately it was my first time with gprep software hence i didnt get it how to save the same

pretty wacked out questions like these.......
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nitin_prakash_khanna
 Post subject: Re: Standard dev gmatprep picture attached
 Post Posted: Thu Nov 12, 2009 10:30 am 
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Students


Posts: 68
Given Mean = 8.1
Std dev = 0.3.

1.5 * Std Dev = 0.3*1.5= 0.45

So Question wants us to find all values between 8.1 +/- 0.45

or in Range 7.65 to 8.55.

Look at all values, out of 12 values only first value 7.51 is not in above range all other 11 values are.

hope it helps.
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Ben Ku
 Post subject: Re: Standard dev gmatprep picture attached
 Post Posted: Thu Dec 03, 2009 4:23 am 
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ManhattanGMAT Staff


Posts: 824
Please read and follow the instructions for this folder.
read-before-you-post-gmatprep-math-guidelines-t2723.html

Please do not include image files. Instead, please type out the entire question, including the answer choices.

_________________
Ben Ku
Instructor
ManhattanGMAT
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