A test has μ = 75, σ = 10. A student scored 60.
What is this student's z-score?
- A
−15
- B
−0.15
- Ccheck_circle
−1.5
- D
1.5
Explanation
z = (60 − 75)/10 = −15/10 = −1.5. The score is 1.5 SDs below the mean.
Summary Statistics for a Quantitative Variable
AP Statistics· difficulty 2/5
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