#### Answer

$\approx 2.0685$

#### Work Step by Step

Use the formula for average value with a = 3, and b = 8. The average price is: $\frac{1}{8-3}\int^{8}_{3}(x+1)^{\frac{1}{2}}dx=\frac{1}{5}.(\frac{x+1}{\frac{1}{2}+1})^{\frac{3}{2}}|^{8}_{3}\approx 2.0685$