PS Question from GMAT Prep

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mail2nikhil01: Newbie | Next Rank: 10 Posts; Posts: 6; Joined: Mon May 05, 2008 2:29 am

by mail2nikhil01 » Mon May 11, 2009 4:08 am

Hi
I am stucked in one question while writing test of GMAT Prep.

Please resolve the same with explanation.

Thanks
Nikhil[/img]

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: PS Problem Of GMAT Prep

Nikhil

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Source: Beat The GMAT — Problem Solving | Mon May 11, 2009 4:08 am

gauravgundal: Master | Next Rank: 500 Posts; Posts: 199; Joined: Mon Apr 06, 2009 4:15 am; Location: India; Thanked: 13 times

by gauravgundal » Mon May 11, 2009 6:59 am

I will go for D

My approach is

there are total 6 number within 1 std dev. of the mean
= 10 -(0.3)*1= 9.7
and
= 10 +(0.3)*1 = 10.3

so
x/100 *8=6
Ans = 75%
Let me i know if i am correct
Thanks

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DeepakR: Master | Next Rank: 500 Posts; Posts: 158; Joined: Tue Sep 30, 2008 8:47 amFollowed by: 1 member; Thanked: 23 times; GMAT Score:660

by DeepakR » Mon May 11, 2009 8:57 am

Ya i too get the same: SD= 0.3 and Mean = 10.0

-------------------- +1 SD = 10.3

-------------------- Mean = 10.0

-------------------- -1 SD = 9.7

The following numbers are within this range from 9.7 to 10.3. They are:
9.9,9.9,9.9,10.0,10.0,10.2 = 6 numbers.

So 6/8 *100 = 75%=D.)

-Deepak

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mail2nikhil01: Newbie | Next Rank: 10 Posts; Posts: 6; Joined: Mon May 05, 2008 2:29 am

by mail2nikhil01 » Mon May 11, 2009 10:17 pm

Thanks Deepak and gurav....I got the solution....If you have any theory or notes related to standard deviation...then could you please provide them

Thanks
Nikhil

Nikhil

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