Answer
$f'(x)=\frac{f(x_{i})-f(x_{i-1})}{x_{i}-x_{i-1}}$
Work Step by Step
We find the "slope" between the points using the formula:
$f'(x)=\frac{f(x_{i})-f(x_{i-1})}{x_{i}-x_{i-1}}$
Graphing these slopes will create a rough graph of the derivative function.
