# 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

Hard### Solution

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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