Standard dev gmatprep picture attached

[vimalshahmph]

http://www.postimage.org/image.php?v=Ts1lWj0A

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

[RonPurewal]

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.

[vimalshahmph]

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.......

[nitin_prakash_khanna]

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.

[Ben Ku]

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.