cookies with SD

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ruplun: Master | Next Rank: 500 Posts; Posts: 232; Joined: Fri Jun 18, 2010 7:09 amFollowed by: 2 members; Thanked: 1 times

by ruplun » Fri May 06, 2011 11:05 pm

Brett discovers that 150 bags of his favorite cookie contain a total of 3750 cookies.He then det
ermines that the cookies in a bag are normally distributed with a stndard deviation of 15.When Brett goes to the store to buy a bag of his favorite cookies, how many of the 1200 bags in the store contain more than 30 cookies?
A.24
B.25
C.50
D.192
E.600

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Source: Beat The GMAT — Problem Solving | Fri May 06, 2011 11:05 pm

4GMAT_Mumbai: Master | Next Rank: 500 Posts; Posts: 161; Joined: Mon Apr 05, 2010 9:06 am; Location: Mumbai; Thanked: 37 times

by 4GMAT_Mumbai » Sat May 07, 2011 12:51 am

Hi,

Handled in this thread way back in 2008 ... https://www.beatthegmat.com/standard-dev ... t8560.html

Guess it is beyond the scope of GMAT

Thanks.

Naveenan Ramachandran
4GMAT, Dadar(W) & Ghatkopar(W), Mumbai

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