Free ACT Practice Question

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ID: ACT-M-113
Section: Math
Topics: Statistics & Probability; Statistics
Difficulty level: Medium

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Which of the following sets has a standard deviation less than the standard deviation of set $X = \{10, 20, 30, 40\}$? $P = \{2, 12, 22, 32\}$ $Q = \{-3, 7, 17, 27\}$ $R = \{-6, 4, 14, 24\}$

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