Just want to add the following regarding mortality rate calculations:
The only way to calculate mortality rate is after the fact - it’s not number of deaths as a percentage of the number infected. So, during an outbreak, the scientists take a snapshot of confirmed cases - say the first 1000 reported/confirmed. They have to wait until all 1000 cases are resolved. The mortality rate is calculated based on the number of deaths vs the number of recovered. So if 20 of those 1000 die, and 980 recover, mortality rate would be 2%.
This virus is slow in reaching final outcome, so without taking periodic snapshots, there are way too many confirmed cases hanging in the balance to know where it will end up.
Mortality rate is a variable based on many different factors. In Hubei, the death rate should be assumed to be higher than other locations (at least as it stands now). They were in the midst of the outbreak before it was identified, and even further along before it was publicly acknowledged. Their healthcare system was overloaded and they were unable to provide adequate care to all patients in a timely fashion.
There are still a lot of unknowns about this virus, and the world is far from knowing what the final average mortality rate will be.