5 people have died that were on the princess cruise out of 705 infected. At just over 1/2 a percent, it is more deadly than the flu, but not 2% and certainly not 7.8%
The princess cruise gives us a crucial piece of information which is a fully tested population.
2 things to consider:
1) population is like older due to being a princess cruise which would increase death rate.
2) not everyone is cleared yet, so more deaths could come