Answer
$np(1-p)\gt10$
That is the only condition necessary to use the normal distribution to approximate the binomial distribution.
Work Step by Step
$np(1-p)=250\times0.46(1-0.46)=250\times0.46\times0.54=62.1\gt10$
Statistics: Informed Decisions Using Data (4th Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0321757270
ISBN 13:
978-0-32175-727-2
Chapter 7 - Review - Review Exercises - Page 394: 13a
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