Answer
$E(X)=57$ trials.
Work Step by Step
$p=\frac{2}{2+18+18}=\frac{1}{19}$ and $r=3$
$E(X)=\frac{r}{p}=\frac{3}{\frac{1}{19}}=3\times19=57$
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 - Section 6.2 - Assess Your Understanding - Applying the Concepts - Page 346: 56d
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