There are TWO different rates being quoted, which can be wildly different but that is because of their context.
The Case Fatality Rate (or Case Fatality Ratio or CFR) is the proportion of people who die from a specified disease among all individuals diagnosed with the disease over a certain period of time.
The Mortality Rate is a measure of the number of deaths (in general, or due to a specific cause) in a particular population, scaled to the size of that population, per unit of time. Mortality rate is typically expressed in units of deaths per 1,000 individuals per year; thus, a mortality rate of 9.5 (out of 1,000) in a population of 1,000 would mean 9.5 deaths per year in that entire population, or 0.95% out of the total.
Thus, for coronavirus, let's assume there are 77,660 confirmed cases of, and 2,663 deaths due to coronavirus in Mainland China. Let's also assume (and sidestep the debate over accuracy) there are 1.3bn people in Mainland China and 200 million under quarantine. With these numbers, depending upon the context, you can get these figures:
Mortality Rate of 2,663 / 1.3bn or 0.0002% or 0.2 people per 100,000 (the context is all of Mainland China)
Mortality Rate of 2,663 / 200MM or 0.0013% or 1.33 people per 100,000 (conxtex is the Rate is conditional upon the people being under quarantine)
CFR of 2,663 / 77660 or 3.4% at this time in Mainland China, without any correction for recovery/"being cured" or timing mismatch (i.e. Not all people in numerator and denominator have been infected or dead for the same amount of time - that would require a cohort analysis).
I am not a biostatistician nor do I play one on TV. But this knowledge should serve you well during this saga.