How does Riot decide which tier to put you in after the provisionals?

So as we all know, we need to complete 10 provisional games at the start of a new season to get into a tier (Bronze, Silver, etc.).
Some people manage to win all their 10 provisional matches and get into only Bronze or Silver, whereas, some people only wins like half their provisionals and still get into Gold tier.
How does this work exactly?
Best Answer
From my knowledge of League of Legends from friends, if it is your first time calibrating into ranked, then you will only be calibrated at about gold 3 (?). Assuming you've played solo and won all of your 10 calibration games for ranked.
This changes when lets say you play with a friend who is platinum. Lets say, for this example, you play with him until level 30 and you win all of your calibration games, you won't get gold 3 (assuming) but you would get a higher rank.
Again, this also can change if you have played ranked before. Lets say, in Season 1 I was ranked gold 3 (because I had one all of my games), next season I might be calibrated to Platinum because of my previous calibration (Assuming that I didn't become worse and won the majority of my games).
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How do League of Legends placements work?
Placement matches are how we determine your starting position on the current season's Ranked ladder. You'll only play them if you're unranked, which happens if you've never played Ranked before or if it's the start of a new season.How do League provisionals work?
This year you'll get a provisional rank after your first placement game. Your provisional rank shows where you'll start the climb and updates after each placement game. Provisional ranks are only visible to you until you complete placements. You can't lose LP during placements, so your provisional rank can only go up.What determines how much lp you get in League of Legends?
The amount is determined based on the difficulty of opponents and the rankings of teammates, among other factors. Once a player has earned 100 LP in their division, they immediately enter a three-game Promotion Series\u2014two victories will allow them to move up one division.What percent of players are diamond in League of Legends?
Distribution of League of Legends (LoL) summoners in North America as of October 2021, by tierCharacteristicShare of playersGold27.7%Platinum10.91%Diamond1.42%Master0.15%5 more rows*+30 LP* How to HACK Your MMR In League of Legends
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