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AP®︎/College Statistics

Course: AP®︎/College Statistics > Unit 4

Lesson 2: Z-scores
Math
AP®︎/College Statistics
Exploring one-variable quantitative data: Percentiles, z-scores, and the normal distribution
Z-scores
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Calculating z-scores

AP.STATS: VAR‑2 (EU), VAR‑2.B (LO), VAR‑2.B.1 (EK), VAR‑2.B.2 (EK) CCSS.Math: HSS.ID.A.4, HSS.ID.A
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Problem

The grades on a geometry midterm at Springer are roughly symmetric with mu, equals, 73 and sigma, equals, 3, point, 0.
Umaima scored 72 on the exam.
Find the z-score for Umaima's exam grade. Round to two decimal places.
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4
  • a mixed number, like 1, space, 3, slash, 4
  • an exact decimal, like 0, point, 75
  • a multiple of pi, like 12, space, start text, p, i, end text or 2, slash, 3, space, start text, p, i, end text
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