So the medical journal The Lancet estimated that approximately 75,000 people were infected with this novel corona virus and the most recent estimate I saw on CNN stated that China has attributed 300 deaths to this virus.
Taking 300 deaths divided by 75,000 infected means 0.4% of people infected die. Now there are a lot of factors (i.e., the state/availability of quality health care for those most affected -the Chinese, who are the people who died - young and old or is it across the board, etc.).
However, just taking 0.4% and multiplying it by the estimated 7.53 billion inhabitants (Google's 2017 estimate) of this planet means 30,120,000+ potentially dead if the virus spreads unchecked. Just a thought