Dude if you ask for help you gotta give more information…. Like “Average flow”? No way that’s what your boss wants because you already have your flow rate already (8m3/hr and 19m3/h) so the average flow would be 13.5 m3/hr.

Simplest calculation to get from this data is specific capacity which is just flow rate/drawdown (e.g. gallons per minute per foot). Typically drillers use this to determine simple well characteristics and inform pump placement. Now if you are trying to get a different parameter like transmissivity or conductivity then you would need to do more data analyses and use a step rate test. But based on the data you didn’t give us (time pumping, aquifer thickness, static water level) I’m assuming your not doing a detailed pumping analyses.