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05 Oct 2017, 07:08
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
51% (00:47) correct
49%
(00:46)
wrong
based on 75
sessions
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Not Attempted Yet
How many elements are there in Set A?
1) Frequency of each element in the set A is 1
2) Standard Deviation of Set A is NOT Positive
Source: https://www.GMATinsight.com
1) Frequency of each element in the set A is 1
2) Standard Deviation of Set A is NOT Positive
Source: https://www.GMATinsight.com
05 Oct 2017, 07:46
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GMATinsight
Statement 1:set can be {1,2,3...} or {1}. in either case frequency is 1 but no of elements are different. Hence insufficient
Statement 2: implies St. Dvi is 0 because standard deviation cannot be negative, it is either positive or 0. Note standard deviation is the square root of variance, hence cannot be negative. so in Set A all elements are equal i.e {1,1,1,1....} or {1}. In either case no of elements are different. hence Insufficient
Combining 1 & 2,it is clear that the set A has only One element. Hence Sufficient
Option C
shuvodip04
Joined: 05 Oct 2017
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Location: India
Concentration: Finance, International Business
Schools: IIMB IIMA ISB'22 (S) IIMA PGPX'22 (I)
GMAT 1: 660 Q48 V33
GMAT 2: 700 Q49 V35 (Online)
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WE:Analyst (Energy)
18 Mar 2019, 00:00
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GMATinsight
From statement 1 : the set can be [1,2,5,6,7] or [3,4,5] nothing conclusive.
From statement 2 : Standard deviation =0 since standard deviation cannot be negative. So that means all the element in the set are the same i.e [2,2,2] or [2]. But we cannot infer anything about the number of elements.
Comibining 1 and 2:
Frequency is 1 and the elements are same. Hence number of elements has to 1.
Answer C
