These ‘crude’ mortality rates are meaningless unless used in context. So what we are seeing is a case mortality rate which means that it is a mortality in those who have been ill enough to be admitted to hospital and be tested. There are two sources of error, one is that we do not have a denominator because of limited testing and the second one, working in the opposite direction is that death in the community and in nursing homes are not being recorded as due to Covid-19 as they are not being tested.
You can also have an age related mortality rate, and this has been estimated as about 15% in the over eighties and about 10% in the over 70s, but again these are age related case mortality rates.
What is however very telling is that overall mortality in Germany has been much less than Italy, Spain, France and U.K. the cause for this is not yet clear.