PRC-2 · Chapter 11 · Question 28 of 60
If a dataset has a mean of 50 and a standard deviation of 5, what is the z-score for a data value of 40?
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: B) -2.0
Explanation
The formula for a z-score is z = (X - Mean) / SD. Here, (40 - 50) / 5 = -10 / 5 = -2.0.
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