Big Trader and Retail Trader

Hi. Can the Forum here tell me how many contracts the BIG Trader are traded in one shot??
I know the small retail Trader like us is traded any from 1 contract to 10 contracts?

Let said Big Trader XXXX contracts
Median Traded 50 contrcats??
Small or Retail Traders trade 1 to 10 contract?

I am trying program the Volume Indicator. Any help will be greatful. Thanks. KL