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During an experiment, some water was removed from each of 6

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Manager
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Joined: 28 Jul 2004
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Schools: Yale SOM, Tuck, Ross, IESE, HEC, Johnson, Booth
During an experiment, some water was removed from each of 6 [#permalink]

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New post 01 Jan 2009, 23:01
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During an experiment, some water was removed from each of 6 water tanks. If the standard deviation of the volumes of water in tanks at the beginning was 10 gallons, what was the std devation of the volumes of water at the end of experiment

1) For each tank, 30% percent of the water which was there at the beginning was removed at the end of experiment

2) the average (Arithmetic mean) volume of water at the end of experiment was 63 gallons


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kris

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Re: Standard deviation of Remaining Water [#permalink]

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New post 02 Jan 2009, 04:52
Answer should be A.

If a number is subtracted from each of the member numbers then the SD remains the same.

However, stmt2 does not give any info to get at SD.

Kudos [?]: 279 [0], given: 0

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User avatar
Joined: 28 Jul 2004
Posts: 136

Kudos [?]: 73 [0], given: 2

Location: Melbourne
Schools: Yale SOM, Tuck, Ross, IESE, HEC, Johnson, Booth
Re: Standard deviation of Remaining Water [#permalink]

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New post 02 Jan 2009, 21:11
that is correct..thanks a lot Thakur!
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kris

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Re: Standard deviation of Remaining Water   [#permalink] 02 Jan 2009, 21:11
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During an experiment, some water was removed from each of 6

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