Answer
$ŷ=11.0748$%
Work Step by Step
$ŷ=-26.3412+1.4794x-0.0136x^2$
For the 40-year-olds, that is, if $x=40$:
$ŷ=-26.3412+1.4794\times40-0.0136\times40^2=11.0748$
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 14 - Section 14.3 - Assess Your Understanding - Applying the Concepts - Page 722: 22b
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