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01 Nov 2013, 07:08
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C
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Difficulty:
45%
(medium)
Question Stats:
59% (00:58) correct
41%
(01:04)
wrong
based on 1668
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Which of the following triples of numbers have the same standard deviation as the numbers r, s, and t?
I. r - 2, s - 2, t - 2
II. 0, r - s, t - s
III. r - 4, s + 5, t - 1
A. I only
B. II only
C. I and II only
D. I and III only
E. I, II, and III
I. r - 2, s - 2, t - 2
II. 0, r - s, t - s
III. r - 4, s + 5, t - 1
A. I only
B. II only
C. I and II only
D. I and III only
E. I, II, and III
01 Nov 2013, 07:16
Kudos
Bookmarks
zbvl
Which of the following triples of numbers have the same standard deviation as the numbers r, s, and t?
I. r-2, s-2, t-2
II. 0, r-s, t-s
III. r-4, s+5, t-1
A. I only
B. II only
C. I and II only
D. I and III only
E. I, II, and III
Please help me figure out II & III. Thanks!
I. r-2, s-2, t-2
II. 0, r-s, t-s
III. r-4, s+5, t-1
A. I only
B. II only
C. I and II only
D. I and III only
E. I, II, and III
Please help me figure out II & III. Thanks!
If we add or subtract a constant to each term in a set the standard deviation will not change.
Set {r-2, s-2, t-2} is obtained by subtracting 2 from each term of {r, s, t}.
Set {0, r-s, t-s} is obtained by subtracting s from each term of {r, s, t}.
Set {r-4, s+5, t-1} is totally different from {r, s, t}.
Thus the answer is I and II only.
Answer: C.
01 Nov 2013, 07:23
Kudos
Bookmarks
Bunuel
zbvl
Which of the following triples of numbers have the same standard deviation as the numbers r, s, and t?
I. r-2, s-2, t-2
II. 0, r-s, t-s
III. r-4, s+5, t-1
A. I only
B. II only
C. I and II only
D. I and III only
E. I, II, and III
Please help me figure out II & III. Thanks!
I. r-2, s-2, t-2
II. 0, r-s, t-s
III. r-4, s+5, t-1
A. I only
B. II only
C. I and II only
D. I and III only
E. I, II, and III
Please help me figure out II & III. Thanks!
If we add or subtract a constant to each term in a set the standard deviation will not change.
Set {r-2, s-2, t-2} is obtained by subtracting 2 from each term of {r, s, t}.
Set {0, r-s, t-s} is obtained by subtracting s from each term of {r, s, t}.
Set {r-4, s+5, t-1} is totally different from {r, s, t}.
Thus the answer is I and II only.
Answer: C.
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PS:
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DS:
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Hope this helps.
