Elementary Statistics (12th Edition)

Published by Pearson
ISBN 10: 0321836960
ISBN 13: 978-0-32183-696-0

Chapter 5 - Discrete Probability Distributions - 5-4 Parameters for Binomial Distributions - Basic Skills and Concepts - Page 225: 3



Work Step by Step

The variance can be counted by raising the standard deviation to the power of two, therefore variance=$n \cdot p \cdot (1-p).$ Here, n=150, p=0.933, therefore variance=$150 \cdot 0.933 \cdot 0.067=9.38.$
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