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# gmat prep ds standard deviation

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gmat prep ds standard deviation [#permalink]

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12 Jun 2007, 10:10
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List S and list T each contain 5 positive integers and for each list the avg (mean) of the integers in the list is 40. if the integers 30,40 and 50 are in both list , is the standard deviation of the integers in list S greater than the list standard deviation of the integers in list T?

(1) the integer 25 is in list S
(2) the integer 45 is in the list
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12 Jun 2007, 12:11
My choice "B"

From (1) we get no info. about List T
From (2) Assuming you meant to say that 45 is in both the lists. Then there is only one choice left for the 5th no. and it is 35 (to get the avg. 40)
The std. dev would be the same.
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12 Jun 2007, 13:01
I'm sorry, I ment to say

List S and list T each contain 5 positive integers and for each list the avg (mean) of the integers in the list is 40. if the integers 30,40 and 50 are in both list , is the standard deviation of the integers in list S greater than the list standard deviation of the integers in list T?

(1) the integer 25 is in list S
(2) the integer 45 is in the list T

sorry
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12 Jun 2007, 13:42
I believe is C

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