An aerospace engineer is testing the backup power system of an atmospheric probe. The system relies on a capacitor bank discharging through an onboard heater. In five test runs, the engineer measures the time $T_{1/2}$ for the potential difference across the capacitor to drop to exactly half of its fully charged value.

The recorded values of $T_{1/2}$ are:

$$23.1ms,22.6ms,23.4ms,22.8ms,23.1ms$$