# Free GMAT Test Questions

Question 1 of 1
ID: GMAT-DS-4
Section: Quantitative Reasoning - Data Sufficiency
Topics: Statistics; Standard Deviation
Difficulty level: Challenging

(Practice Mode: Single selected Question » Back to Overview)

What is the standard deviation of 1, 2, 3, $k$, 5, 6 and 7?

1. Standard deviation of 2, 3, 4, $(k+1)$, 6, 7 and 8 is 2.
2. Standard deviation of 0, 1, 2, $(k-1)$, 4, 5, and 6 is 2.
AStatement (1) ALONE is sufficient, but statement (2) ALONE is not sufficient to answer the question asked.
BStatement (2) ALONE is sufficient, but statement (1) ALONE is not sufficient to answer the question asked.
CBOTH statements (1) and (2) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient to answer the question asked.