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A vending machine is designed to dispense 8 ounces of coffee

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Joined: 10 Feb 2006
Posts: 664
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Kudos [?]: 65 [0], given: 0

A vending machine is designed to dispense 8 ounces of coffee [#permalink] New post 25 Sep 2006, 21:39
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
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Joined: 14 Aug 2006
Posts: 368
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 [#permalink] New post 25 Sep 2006, 21:50
1 standard deviation is 0.3
1.5 standard deviation is .45


The range is 7.65 to 8.55

So answer is E (11)
  [#permalink] 25 Sep 2006, 21:50
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A vending machine is designed to dispense 8 ounces of coffee

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