In typical transactions, the commission is...?
There is no typical transaction, and there is no typical, set, standard, normal, usual, regular, common, everyone-charges-it commission. Each agent, and agency has their own ideas of what it takes to list/buy a home and they charge accordingly.
Commissions are negotiable, but that doesn't mean that each and every agent, or agency, will negotiate their commission. While there is no 'standard' commission, there might be a minimum commission at a particular office, or even throughout a specific agency.
But we are not allowed, based on Sherman anti-trust rules, to discuss those rates amongst ourselves (real estate professionals), and assuredly cannot discuss it here, in a national forum. In order to find out what the commission is from an agent/agency you might use, you'll have to sit and interview them.