Answer
$σ_X=1.1154$ games
Work Step by Step
$σ_X=\sqrt {Σ[x^2.P(x)]-μ_x^2}=\sqrt {[4^2\times P(4)+5^2\times P(5)+6^2\times P(6)+7^2\times P(7)]-5.4306^2}=\sqrt {[16\times0.2778+25\times0.2361+36\times0.2639+49\times0.2222]-29.49141636}=1.1154$
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 6 - Review - Review Exercises - Page 355: 3d
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