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.
Related Questions
- A certain computer program generates a sequence of numbers a1, a2, … , an such that a1 = a2 = 1…
- If Sn is the sum of the first n terms of a certain sequence and if Sn = n(n+1) for all positive integers…
- If 0 < x < 2, which of the following must be greatest?
- If (2^x) (2^y) = 8 and (9^x)(3^y) = 81, then (x,y) equals:
- If x is an integer greater than 1, is x equal to the 12th power of an integer?