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What is the standard deviation of set S ? 1. Set S consists

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What is the standard deviation of set S ? 1. Set S consists [#permalink] New post 17 Feb 2008, 05:41
What is the standard deviation of set S ?
1. Set S consists of 10 even integers
2. The range of set S is 18
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Re: Tricky statistics [#permalink] New post 17 Feb 2008, 06:09
E

--
A: INSUFF (what even integers?)
B: INSUFF (Range tells 18, but other numbers are not known)

A & B: INSUFF (10 even integers with range 18 but they may not be consecutives and there can be repetitions)
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Re: Tricky statistics [#permalink] New post 21 Feb 2008, 22:59
srp wrote:
E

--
A: INSUFF (what even integers?)
B: INSUFF (Range tells 18, but other numbers are not known)

A & B: INSUFF (10 even integers with range 18 but they may not be consecutives and there can be repetitions)


if the question were to be: distinct even integers?
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Re: Tricky statistics [#permalink] New post 22 Feb 2008, 14:51
marcodonzelli wrote:
srp wrote:
E

--
A: INSUFF (what even integers?)
B: INSUFF (Range tells 18, but other numbers are not known)

A & B: INSUFF (10 even integers with range 18 but they may not be consecutives and there can be repetitions)


if the question were to be: distinct even integers?


Probably be C then, since it would be st dev of any range of 18 consecutive even integers, which I think always be equal.

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Re: Tricky statistics [#permalink] New post 23 Feb 2008, 08:59
rca215 wrote:
marcodonzelli wrote:
srp wrote:
E

--
A: INSUFF (what even integers?)
B: INSUFF (Range tells 18, but other numbers are not known)

A & B: INSUFF (10 even integers with range 18 but they may not be consecutives and there can be repetitions)


if the question were to be: distinct even integers?


Probably be C then, since it would be st dev of any range of 18 consecutive even integers, which I think always be equal.


St. dev is the spread around the mean.
If all even integers are distinct, they will spread in the same pattern around the mean.
In that case answer would be 'C'.
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Re: Tricky statistics [#permalink] New post 23 Feb 2008, 09:18
rca215 wrote:
marcodonzelli wrote:
srp wrote:
E

--
A: INSUFF (what even integers?)
B: INSUFF (Range tells 18, but other numbers are not known)

A & B: INSUFF (10 even integers with range 18 but they may not be consecutives and there can be repetitions)


if the question were to be: distinct even integers?


Probably be C then, since it would be st dev of any range of 18 consecutive even integers, which I think always be equal.


it could be distinct integers with a range of 18 or some distinct and some repetitive integers with the same range. for ex:

a: 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20
b: 2, 2, 6, 8, 10, 12, 14, 16, 18, and 20

in above cases, a and b have different Standard Deviations but fulfill both requirements in st. 1 and 2.

so only E makes sense.

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Re: Tricky statistics [#permalink] New post 06 Apr 2008, 17:01
i have a love/hate relationship with these types of questions.

I saw even integers and read "consecutive even integers".

Great question!
Re: Tricky statistics   [#permalink] 06 Apr 2008, 17:01
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What is the standard deviation of set S ? 1. Set S consists

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