Problem

Determine the average value of $f(x)$ over the interval from $x=a$ to $x=b$, where $f(x)=\frac{1}{x}, a=\frac{1}{6}$, and $b=6$. The average value is (Type an exact answer.)

Solution

Step 1 :The average value of a function $f(x)$ over the interval $[a, b]$ is given by the formula: \(\frac{1}{b-a}\int_{a}^{b}f(x)dx\)

Step 2 :In this case, $f(x) = \frac{1}{x}$, $a = \frac{1}{6}$, and $b = 6$. So we need to compute the integral of $f(x)$ from $a$ to $b$ and then divide by the length of the interval.

Step 3 :The integral of $f(x)$ from $a$ to $b$ is $\ln|b| - \ln|a|$

Step 4 :The length of the interval from $a$ to $b$ is $b - a$

Step 5 :Substitute the values of $a$, $b$, and the integral of $f(x)$ from $a$ to $b$ into the formula for the average value of a function over an interval

Step 6 :The average value of $f(x)$ over the interval from $x=a$ to $x=b$ is \(\boxed{0.307158766153381 + 0.171428571428571\log(6)}\)

From Solvely APP
Source: https://solvelyapp.com/problems/24475/

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