Answer
9.38
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=$150 \cdot 0.933 \cdot 0.067=9.38.$
Essentials of Statistics (5th Edition)
by Triola, Mario F.
Published by
Pearson
ISBN 10:
0-32192-459-2
ISBN 13:
978-0-32192-459-9
Chapter 5 - Discrete Probability Distributions - 5-4 Parameters for Binomial Distributions - Page 226: 3
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