@vvtuav No one knows for sure. Possibility, Interview may be a significant factor for final selection, but whether it is 100% or 50% or 20% along with other factors which they have tabulated and ranked, no one knows and it likely may differ with each program.
Definitely your profile has attracted for an interview for a reason (though you feel your stat is low). So take advantage of that than worrying or speculating about the end result. Be prepared to talk about whatever you have written in essays or the activities which attracted. Be yourself.