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List A has 80 numbers, and standard deviation is 0.

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Sarastudyhard
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List A has 80 numbers, and standard deviation is 0. [#permalink] New post   Updated on: 06 Dec 2020, 13:19
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List A has 80 numbers, and standard deviation is 0. Then List B has one number more than List A, which is 92. The average of list B is 12.

The standard deviation of List B is?

Show: ::
2.91%

Originally posted by Sarastudyhard on 06 Dec 2020, 11:49.
Last edited by Sarastudyhard on 06 Dec 2020, 13:19, edited 1 time in total.
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Re: List A has 80 numbers, and standard deviation is 0. [#permalink] New post   06 Dec 2020, 11:52
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Please Sir, provide the OA
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Re: List A has 80 numbers, and standard deviation is 0. [#permalink] New post   07 Dec 2020, 09:40
Carcass wrote:
Please Sir, provide the OA


Sorry could you please give me an example?
Thanks
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Re: List A has 80 numbers, and standard deviation is 0. [#permalink] New post   07 Dec 2020, 09:56
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Numeric entry has always a number as Official Question

This is the standard of the GRE exam
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Re: List A has 80 numbers, and standard deviation is 0. [#permalink] New post   07 Dec 2020, 10:42
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Sarastudyhard wrote:
List A has 80 numbers, and standard deviation is 0. Then List B has one number more than List A, which is 92. The average of list B is 12.

The standard deviation of List B is?

Show: ::
2.91%


This is a bad question for two reasons:
1) The relationship between List A and List B is unclear. Are the two lists identical, except for one additional value in List B. Or is it simply the case that List A has 80 numbers and list B has 81 numbers?

2) The GRE won't require you to calculate any standard deviations (unless the results are trivial, such as the standard deviation is 0, or we are looking for a "new" standard deviation after performing at the same operation on each value in a set.

What's the source of this question?
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Sarastudyhard
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Re: List A has 80 numbers, and standard deviation is 0. [#permalink] New post   08 Dec 2020, 06:17
GreenlightTestPrep wrote:
Sarastudyhard wrote:
List A has 80 numbers, and standard deviation is 0. Then List B has one number more than List A, which is 92. The average of list B is 12.

The standard deviation of List B is?

Show: ::
2.91%


This is a bad question for two reasons:
1) The relationship between List A and List B is unclear. Are the two lists identical, except for one additional value in List B., Or is it simply the case that List A has 80 numbers and list B has 81 numbers?

2) The GRE won't require you to calculate any standard deviations (unless the results are trivial, such as the standard deviation is 0, or we are looking for a "new" standard deviation after performing at the same operation on each value in a set.

What's the source of this question?


Hi,
I am also surprised when I meet this question. The source is from a GRE tutor, but he only gives me the answers to the question not how to solve it.
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Re: List A has 80 numbers, and standard deviation is 0. [#permalink] New post   08 Dec 2020, 06:21
Sarastudyhard wrote:
Hi,
I am also surprised when I meet this question. The source is from a GRE tutor, but he only gives me the answers to the question not how to solve it.


There are TONS of great (official) questions on this website. Unless you've answered all of them, I wouldn't bother with questions from other sources.
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Re: List A has 80 numbers, and standard deviation is 0. [#permalink] New post   08 Dec 2020, 06:38
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GreenlightTestPrep wrote:
Sarastudyhard wrote:
Hi,
I am also surprised when I meet this question. The source is from a GRE tutor, but he only gives me the answers to the question not how to solve it.


There are TONS of great (official) questions on this website. Unless you've answered all of them, I wouldn't bother with questions from other sources.


I do not think is an easy task solving more than 10,000 thousand questions :roll:
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Re: List A has 80 numbers, and standard deviation is 0. [#permalink] New post   18 Jul 2022, 22:22
Hello from the GRE Prep Club BumpBot!

Thanks to another GRE Prep Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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