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cookies with SD

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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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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