Solutions
Get detailed explanations to advanced GMAT questions.
Question
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
Option A:
d+3
Option B:
d+1
Option C:
6d
Option D:
3d
Option E:
d
Difficulty Level
HardSolution
Option E is the correct answer.
Option Analysis
Adding or subtracting each and every element by some k, the standard deviation will not change.
So here (Because k =1) the standard deviation is the same d.
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