Bunuel
Competition Mode Question
Is the standard deviation of set A is greater than standard deviation of set B ?
(1) Set A consists of consecutive multiples of 10
(2) Set B consists of consecutive multiples of 2
Target question: Is the standard deviation of set A is greater than standard deviation of set B ?When I scan the two statements, they both feel insufficient, AND I’m pretty sure I can identify some cases with conflicting answers to the
target question. So, I’m going to head straight to……
Statements 1 and 2 combined There are several scenarios that satisfy BOTH statements. Here are two:
Case a: Set A = {10, 20, 30, 40} and
Set B = {2, 2, 2, 2}. In this case, the answer to the target question is
YES, the standard deviation of set A is greater than standard deviation of set B Case b:
Set A = {11, 11, 11, 11} and
Set B = {2, 20, 200, 2000}. In this case, the answer to the target question is
NO, the standard deviation of set A is NOT greater than standard deviation of set B Since we can’t answer the
target question with certainty, the combined statements are NOT SUFFICIENT
Answer: E
Can you please share some clarifications on the highlighted examples. Shouldn't the numbers be
of 10 and 2 respectively.
Also - Can we just conclude that the information combined is not sufficient as the number of terms are not known in either of the sets ?