The mean value of a function f(x) from point ‘a’ to point ‘b’ is given by

A

$$\frac{f(a)+f(b)}{2}$$

B

$$\frac{f(a)+2f(\frac{a+b}{2})+f{b}}{4}$$

C

$$\int_{a}^{b} f(x) dx$$

D

$$\frac{\int_{a}^{b} f(x) dx}{b-a}$$