Answer
$\mu=7.22$
$\sigma^2=2.17$
$\sigma=1.47$
Work Step by Step
Use the definitions and formula,
mean=$\mu=7.22$
variance=$\sigma^2=2.17$
standard deviation=$\sigma=1.47$
Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition
by Bluman, Allan
Published by
McGraw-Hill Education
ISBN 10:
0078136334
ISBN 13:
978-0-07813-633-7
Chapter 5 - Discrete Probability Distributions - Review Exercises - Section 5-2 - Page 305: 9
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