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11 Nov 2019, 01:20
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
72% (01:37) correct
28%
(01:29)
wrong
based on 153
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Sets X and Y consist solely of positive integers. Each set contains at least two elements, and no element appears more than once within a set. Sets X and Y contain the same number of elements. Is the standard deviation of set X greater than the standard deviation of set Y?
(1) The positive difference between the range of set X and set Y is 12
(2) Each element of set Y is the square if an element of set X
11 Nov 2019, 02:00
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1)We don't know which set has the greater range,from which we cannot say which set has the greater SD.
INSUFFICIENT.
2)the values in X are less spread out than are the values in Y.
So it's sufficient to say that y will have greater SD than x.
Sufficient
OA:B
INSUFFICIENT.
2)the values in X are less spread out than are the values in Y.
So it's sufficient to say that y will have greater SD than x.
Sufficient
OA:B
Archit3110
11 Nov 2019, 03:24
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#1
The positive difference between the range of set X and set Y is 12
X= (a,b) Y = ( c,d)
d-a = 12
insufficeint
#2
Each element of set Y is the square if an element of set X
so we can say that elements in set Y are more widely spread than in X so SD of X <SD of Y
IMO B
Sets X and Y consist solely of positive integers. Each set contains at least two elements, and no element appears more than once within a set. Sets X and Y contain the same number of elements. Is the standard deviation of set X greater than the standard deviation of set Y?
(1) The positive difference between the range of set X and set Y is 12
(2) Each element of set Y is the square if an element of set X
The positive difference between the range of set X and set Y is 12
X= (a,b) Y = ( c,d)
d-a = 12
insufficeint
#2
Each element of set Y is the square if an element of set X
so we can say that elements in set Y are more widely spread than in X so SD of X <SD of Y
IMO B
Sets X and Y consist solely of positive integers. Each set contains at least two elements, and no element appears more than once within a set. Sets X and Y contain the same number of elements. Is the standard deviation of set X greater than the standard deviation of set Y?
(1) The positive difference between the range of set X and set Y is 12
(2) Each element of set Y is the square if an element of set X
