How to calculate the average worker hashrate on a pool? I just calculated the average hashrate of all poolminers on Slushpool by dividing the Pool Scoring Hash Rate by the amount of active workers:

So with current values that is: 641.1 Ph/s / 30287 ~= 21,2 TH/s

Is this the right way to do it, or am I missing something? 
That seems to be pretty high ...
This seems correct, as far as I understand.