Average Value of a Function

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Which of the following expressions represents the average value of the function $f(x)=e^{x}-x$ on the interval $[1,3]$ ?

$\int_{1}^{3} (e^{x}-x)\,dx$

$\frac{1}{3-1}*\int_{1}^{3} (e^{x}+x)\,dx$

$\frac{1}{3-1}*\int_{1}^{3} (e^{x}-x)\,dx$

$\frac{1}{3}*\int_{1}^{3} (e^{x}-x)\,dx$

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