@Builder,
So far, one can only estimate the so-called lethality rate of Covid-19. The main problem is that no one knows how many people are really ill.
In Italy, for example, the virus initially spread unnoticed. People were not tested for the virus until the first deaths occurred - but by that time a huge number of people had already been infected. The chains of infection could no longer be traced. The result: the clinics are overburdened.
In Germany it was different: a lot of testing was done from the beginning, many cases were discovered - and there was still a chance to identify contact persons. But thus the number of confirmed infected persons is correspondingly high.
This is an important aspect for the analysis of case numbers: A higher number of officially confirmed infected persons does not necessarily mean that a country is more severely affected - perhaps testing is simply better.
One thing is clear: the official case numbers are always only those that the authorities know. In fact, considerably more people will be affected. This is mainly because the majority of known infected persons show only very mild symptoms.