Answer
See below.
Work Step by Step
Let $P(T)=x$, then $P(H)=4x$. We also know that $P(T)+P(H)=1$, thus $x+4x=1\\5x=1\\x=0.2$.
Thus $P(T)=0.2,P(H)=0.8$.
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 10 - Section 10.3 - Probability - 10.3 Assess Your Understanding - Page 705: 27
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