Average Value of a Function
Which of the following expressions represents the average value of the function $$f(x)=e^{x}-x$$ on the interval $$[1,3]$$?
A
$$\int_{1}^{3} (e^{x}-x)\,dx$$
B
$$\frac{1}{3-1}*\int_{1}^{3} (e^{x}+x)\,dx$$
C
$$\frac{1}{3-1}*\int_{1}^{3} (e^{x}-x)\,dx$$
D
$$\frac{1}{3}*\int_{1}^{3} (e^{x}-x)\,dx$$
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