But honestly, how can anyone reliably predict the remaining vote given the Wuhan Virus impact? Will Democrats really stay home, or have an awesome turnout? Will Republicans really blow Dems out of the water on 11/3, or turn out to be chicken?
I would guess you look at total registration and start with 2016’s 75% turnout. That would be a reasonable first estimate.
FL registered 14.065M. 75% would be 10.5M. So the elections official is looking for 79%. VBM is generally accepted as increasing overall turnout and thus, 4% over 2016. Reasonable.