Answer
$88.6$ percent.
Work Step by Step
Use the given model function
$P(x)=\frac{90}{1+271e^{-0.122x}}$
For $x=80$, we have
$P(80)=\frac{90}{1+271e^{-0.122(80)}}\approx88.6$ percent.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 3 - Section 3.5 - Exponential Growth and Decay; Modeling Data - Exercise Set - Page 507: 44
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