Answer
-19
Work Step by Step
Use the formula for average value with a =1, and b = 4. The average price is $\frac{1}{4-1}\int^{4}_{1}(2-3x^{2})dx=\frac{1}{3}(2x-\frac{3x^{3}}{3})|^{4}_{1}=-19$
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