The average current that the ErgoBot used during these 8.0 hours can be calculated using Ohm's Law:
I = Q / t
where I is the current, Q is the charge, and t is the time.
The charge Q can be calculated from the battery capacity C and the voltage V of the battery:
Q = C * V
where C = 1000 mAh and V is the voltage of the battery.
The voltage of the battery is not given, so let's assume it is 5 volts, which is typical for many portable devices.
Q = 1000 mAh * (1 Ah / 1000 mAh) = 1 Ah
Q = 1 Ah * 5 V = 5 Wh
The time t is given as 8.0 hours.
I = Q / t = 5 Wh / 8.0 h = 0.625 A
Therefore, the average current that the ErgoBot used during these 8.0 hours is 0.625 A.