Answer
(a) $0.6827$, $0.68$
Work Step by Step
(a) With an approximation up to four digits after the decimal, for $\pm\sigma$, we can get an area of $0.6827$ while the empirical rule gives $0.68$
The Basic Practice of Statistics 7th Edition
by Moore, David S.; Notz, William I.; Fligner, Michael A.
Published by
W. H. Freeman
ISBN 10:
146414253X
ISBN 13:
978-1-46414-253-6
Chapter 3 - The Normal Distributions - Chapter 3 Exercises - Page 99: 3.52a
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