THIS IS HOW PROVISIONALS WORK
If it's you or your ranked team's first time playing ranked, you start at 0 MMR. During your first 10 games, (provisionals) you get MMR (exact number of MMR varies) for each win and lose MMR for each lose. At the end of this era of time, you will be given a rank corresponding to your current MMR.
I say this because i often see people who do their provisionals for the first time and say something along the lines of "I win 7/9 of my games!!! I bet i'll get gold 1!" "Man my ranked team finished provisionals and got bronze 1. Gonna disband and keep tryin till we get gold." "Can you play my first 10 ranked games? If i win all 10 games i will instantly get into plat 1"
Then i tell them that the highest a person can get after their provisionals starting at 0 MMR is about silver 3 (probably higher, never seen it) Then they say "No Uberdanger finished his provisionals and got plat 1!" Then i have to go through the trouble of explaining that you start at 0 MMR and the reason why Uberdanger got plat 1 is because his MMR from last season was diamond and after provisionals, if you have diamond mmr you will get plat (because plat1 is the highest rank you can get from provisionals)
Common sense guys. If everyone starts with 0 mmr for provisional, then every time the season resets, your provisionals will have a chance of having 3 diamonds and 2 plats vs 5 bronze.