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# A vending machine is designed to dispense 8 ounces of coffee

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Joined: 10 Feb 2006
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A vending machine is designed to dispense 8 ounces of coffee [#permalink]

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25 Sep 2006, 22:39
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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 has a mean of 8.1 ounces and a standard deviation of 0.3 ounce, how many of the 12 listed amounts are within 1.5 st dev of the mean.

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 four
b. six
c. nine
d. ten
e. eleven
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Senior Manager
Joined: 14 Aug 2006
Posts: 363
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25 Sep 2006, 22:50
1 standard deviation is 0.3
1.5 standard deviation is .45

The range is 7.65 to 8.55

25 Sep 2006, 22:50
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