Estimating the unknown.
Epidemiologists have records of various new virus strains appearing and spreading. This includes SARS, MERS, and other strains. They know what the early estimates were and how those evolved over time. They have models of the spread of infectious diseases based on virulence and other factors.
The data you report on the number infected and the number who have died is only a summary of their data. They also have a good idea how long various people have been infected and they have a good idea on different courses of progression.
This extensive knowledge allows them to compute a mortality rate that is far more accurate than simply dividing the number who have died by the number who have been infected.
For all those reasons, I trust their estimate is more accurate than something you or I could derive by computing a ratio of two reported numbers. Therefore, I report the scientific estimates as being the best available at this time and don't pretend to know more than scientists who have studied this problem for decades.
You are always welcome to your own opinion.
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