So the answer to my earlier question would be "yes, Slobodan, you got it right." Meaning that 80% (in my question, and 90% in your answer) of vaccinated people would be totally protected.
80% of the recipients will have a complete protection (immunity), while 20% won't have any.
I said in my response I don't "believe" you have it right, I'm not an immunologist. I think that saying one person will have total or "
complete protection" and someone else "won't have
any" isn't really how vaccines work. Vaccines work by giving your own immune system a head start in attacking a disease, by essentially providing it with a disease sample (which cannot replicate and cause disease) ahead of being infected to provide faster recognition if infected and priming the production of antibodies to attack and destroy it. That's my layman's understanding of how all vaccines of every type work—but I could be wrong or over simplifying.
For example, with the current COVID vaccines, some people who are vaccinated may become infected and become sick, but with far less severe symptoms and disease course than an unvaccinated person due to the boost in immune response, from vaccination, prior to infection. So while they may not have had "complete protection" from the disease, they did benefit from some protection in reduction of severity. As others have said, a vaccine isn't a shield that provides a complete barrier to infection. A vaccine isn't like an on/off switch where it's providing ""complete protection" or none at all.
If you really are looking for definitive answers, I would suggest Google. I'm getting worn out as a Google substitute. If it relieves me from more questions, I'll just say "yes, Slobodan, you got it right.", hand you your gold star, and take a nice nap.
https://www.nature.com/articles/A guide to vaccinology: from basic principles to new developments