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GRE Prep Club Team Member
Joined: 20 Feb 2017
Posts: 2506
Given Kudos: 1055
GPA: 3.39
If the positive number d is the standard deviation of n, k and p then
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06 Feb 2023, 21:58
06 Feb 2023, 21:58
Expert Reply
00:00
Question Stats:
75% (00:23) correct
25% (00:15) wrong based on 4 sessions
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If the positive number d is the standard deviation of n, k and p then the standard deviation of n+1, k+1 and p+1 is
(A) d+3
(B) d+1
(C) 6d
(D) 3d
(E) d
(A) d+3
(B) d+1
(C) 6d
(D) 3d
(E) d
Re: If the positive number d is the standard deviation of n, k and p then
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08 Feb 2023, 06:06
08 Feb 2023, 06:06
2
Ans is E
Std Dev does not change if the same number is subtracted or added to all the elements. It remains unchanged
Std Dev does not change if the same number is subtracted or added to all the elements. It remains unchanged
Re: If the positive number d is the standard deviation of n, k and p then
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08 Feb 2023, 10:11
08 Feb 2023, 10:11
Expert Reply
Standard deviation depends on the relative placement of numbers with respect to each other only.
So standard deviation in these two cases is the same :
--------n---k-----p-----------
----------n---k-----p---------
Hence the standard deviation of the new set will be d only.
Answer (E)
So standard deviation in these two cases is the same :
--------n---k-----p-----------
----------n---k-----p---------
Hence the standard deviation of the new set will be d only.
Answer (E)
