[4 points] To find the value of gravitational acceleration ($g$), a student uses a simple pendulum for which the time period ($T$) is given by $T = 2\pi \sqrt{\frac{l}{g}}$, where $l$ is the length of the pendulum. The student measures the length as 48 cm with 1 mm accuracy and the time for 50 oscillations as 40 s with 1 s accuracy. Find the value of $g$ with error limits.