Zeph won't be able to get a weighted average can guarantee!
This is for those that want easier weighted averages (primarily for 3BLD/4BLD/5BLD)
A weighted mean is essentially what you get when you DNF all your solves until your accuracy rate is at 50%, and then the mean from there is calculated. A weighted average does the same thing but also truncates the lower and upper 5% from the average.
A good number for weighted means would be 100 solves, but nothing's stopping you from doing more (or fewer)