Answer
a. -1.21
b. Jan's age is below the average age.
c. Not an unusual z-score
Work Step by Step
z = (x - μ) / σ = (24-28.1) / 3.4 = 1.21
Usual values have z score in the range -2 and 2
Elementary Statistics: Picturing the World (6th Edition)
by Larson, Ron; Farber, Betsy
Published by
Pearson
ISBN 10:
0321911210
ISBN 13:
978-0-32191-121-6
Chapter 2 - Descriptive Statistics - Section 2.5 Measures of Position - Exercises - Page 112: 42
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