Math questions from mba.com and GMAT Prep software
sanjeethbm
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Coffee Vending machine - From GMAT Prep

by sanjeethbm Tue Jun 21, 2011 4:28 am

7.51 8.22 7.86 8.36
8.09 7.83 8.30 8.01
7.73 8.25 7.96 8.53
A vending machine is designed to dispense 8 ounces of coffee into a cup. After a test that recorded the number of ounces of coffee in each of 1000 cups dispensed by the vending machine, the 12 listed amounts, in ounces, were selected from the data. If the 1000 recorded amounts have a mean score of 8.1 ounces and a standard deviation of 0.3 ounce, how many of the 12 listed amounts are within 1.5 standard deviations of the mean.

Four Six Nine Ten Eleven

How do I approach this problem?

- Sanjeeth
Milanproda1
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Re: Coffee Vending machine - From GMAT Prep

by Milanproda1 Thu Jun 23, 2011 12:57 am

There is a great explanation by Ron on Thursdays with Ron:

http://vimeo.com/15781353

Go to the 47 minute mark for the explanation
sanjeethbm
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Re: Coffee Vending machine - From GMAT Prep

by sanjeethbm Fri Jun 24, 2011 9:47 pm

Thank you folks! Problem never looked simpler before.

- Sanjeeth
RonPurewal
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Re: Coffee Vending machine - From GMAT Prep

by RonPurewal Wed Jun 29, 2011 6:12 am

thanks for the citation.
Pueden hacerle preguntas a Ron en castellano
Potete fare domande a Ron in italiano
On peut poser des questions à Ron en français
Voit esittää kysymyksiä Ron:lle myös suomeksi

Un bon vêtement, c'est un passeport pour le bonheur.
– Yves Saint-Laurent