#### Answer

Normal approximation should not be used.

#### Work Step by Step

q=1-p=1-0.8=0.2
$n\cdot p=20\cdot 0.8=16\geq5.$
$n\cdot q=20\cdot 0.2=4<5.$
Hence, the requirements are not satisfied, therefore normal approximation should not be used.

Published by
Pearson

ISBN 10:
0321836960

ISBN 13:
978-0-32183-696-0

Normal approximation should not be used.

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