[goalieca]

Here’s the cdc estimates used for modelling.

https://www.cdc.gov/coronavirus/2019-ncov/hcp/planning-scena...

Their best guess scenario is 35% asymptomatic. Of the symptomatic the rate is 0.05% for those under 50. All ages is 0.4%.

[nradov → goalieca]

It's important to note that the 0.4% number is the CDC's best estimate of symptomatic case fatality rate. The actual infection fatality rate appears to be somewhat lower.