#### Answer

$15$

#### Work Step by Step

The average is $$\frac{1}{4-1}\int_1^4f(x)dx=5\Longrightarrow \int_1^4f(x)dx=15. $$

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Published by
W. H. Freeman

ISBN 10:
1464125260

ISBN 13:
978-1-46412-526-3

$15$

The average is $$\frac{1}{4-1}\int_1^4f(x)dx=5\Longrightarrow \int_1^4f(x)dx=15. $$

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