## Coffee Vending machine - From GMAT Prep

Math questions from mba.com and GMAT Prep software
sanjeethbm
Students

Posts: 12
Joined: Wed Dec 31, 1969 8:00 pm

### Coffee Vending machine - From GMAT Prep

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
Course Students

Posts: 48
Joined: Mon Sep 27, 2010 9:49 pm

### Re: Coffee Vending machine - From GMAT Prep

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
Students

Posts: 12
Joined: Wed Dec 31, 1969 8:00 pm

### Re: Coffee Vending machine - From GMAT Prep

Thank you folks! Problem never looked simpler before.

- Sanjeeth
RonPurewal
Students

Posts: 19747
Joined: Tue Aug 14, 2007 8:23 am

### Re: Coffee Vending machine - From GMAT Prep

thanks for the citation.