Digital ACT Math Practice Question #1450
Test your problem-solving accuracy on this official-caliber item. Select an answer choice to check your reasoning instantly.
Greatest dispersion from center: {0, 0, 10, 20, 20} puts the most points farthest from the mean.
Standard deviation measures spread from the mean. All sets have mean 10. In {0, 0, 10, 20, 20}, four of the five values lie 10 units away from the mean, producing variance (4*100 + 0)/5 = 80, greatest of all sets....
Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...
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