Average Value of a Function
Which of the following expressions represents the average value of the function $$f(x) = x^2$$ on the interval $$[0, 40]$$?
A
$$\int_{0}^{40} x^2\,dx$$
B
$$\frac{1}{2} \int_{0}^{40} x^2\,dx$$
C
$$\frac{1}{40} \int_{0}^{40} x\,dx$$
D
$$\frac{1}{40} \int_{0}^{40} x^2\,dx$$
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