Answer
30 customers
Work Step by Step
Mean = 36
S.D = 8
Mean + 2 S.D = 36 + 16 = 52
Mean - 2 S.D = 36 - 16 = 20
So k = 2
Probability = 0.75
n = 40 * 0.75 = 30
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 - Review Exercises - Page 118: 31
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