The Basic Practice of Statistics 7th Edition

Published by W. H. Freeman
ISBN 10: 146414253X
ISBN 13: 978-1-46414-253-6

Chapter 3 - The Normal Distributions - Chapter 3 Exercises - Page 96: 3.30c

Answer

89.44%

Work Step by Step

$ (.6-.8)/.078 \lt z \lt (.9-.8)/.078$ $-.2/.078 \lt z \lt .1/.078$ $-2.56 \lt z \lt 1.28$ -2.56 has a normal value of .0052 1.28 has a normal value of .8997 $.8997 - .0052 = .8944$
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