WHO:

https://www.who.int/docs/default-source/coronaviruse/situation-reports/20200123-sitrep-3-2019-ncov.pdf

Twenty five percent of confirmed cases reported by China have been classified by Chinese health authorities as seriously ill (fromWubei Province: (16% severely ill, 5% critically ill, and 4% having died).

https://www.who.int/dg/speeches/detail/who-director-general-s-opening-remarks-at-the-media-briefing-on-covid-19---24-february-2020

They found that the fatality rate is between 2% and 4% in Wuhan, and 0.7% outside Wuhan.

https://www.who.int/news-room/detail/23-01-2020-statement-on-the-meeting-of-the-international-health-regulations-(2005)-emergency-committee-regarding-the-outbreak-of-novel-coronavirus-(2019-ncov)

the proportion of deaths in currently reported cases of 4% (17 of 557)

Массмедиа:

https://www.cnbc.com/2020/03/03/who-says-coronavirus-death-rate-is-3point4percent-globally-higher-than-previously-thought.html

WHO says coronavirus death rate is 3.4% globally, higher than previously thought

https://www.businessinsider.com/who-confirms-coronavirus-global-death-rate-rises-fatalities-numbers-2020-3

The latest coronavirus death rate is 3.4% — higher than earlier figures.

https://www.foxnews.com/health/who-says-coronavirus-death-rate-3-4-percent-olympics-delay-possibility

Coronavirus global death rate at 3.4 percent, Olympics delay a possibility