Complete the table and determine the value of g from the given data on a simple pendulum.

Step 1: Complete the table by converting $l$ from cm to m and using the provided $T^2$ values.
The formula for the period of a simple pendulum is $T = 2\pi \sqrt{\frac{l}{g}}$.
Squaring both sides gives $T^2 = \frac{4\pi^2 l}{g}$.
This equation is in the form $y = mx$, where $y = T^2$, $x = l$, and the slope $m = \frac{4\pi^2}{g}$.

The data from the table, with $l$ converted to meters, is:

| $l$ (cm) | $l$ (m) | $T^2$ (s$^2$)