Answer
20 high school students.
Work Step by Step
$E(X)=11$ and $p = 55$% $= 0.55$
$E(X)=np$
$11=n\times0.55$
$n=\frac{11}{0.55}=20$
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: 53a
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