Using the space shuttle program as a comparison, because it's easy to get the numbers. There were 13 total deaths (7 from Challenger, 6 from Columbia [0]) during the program. Over 135 missions, the Space Shuttle took 817 people into space. (From [1], the sum of the "Crew" column. The Space Shuttle carried 355 distinct people, but some were on multiple missions.)

So the risk of death could be estimated as 2/135 (fatal flights / total flights) or as 13/817 (total fatalities / total crew). These are around 1.5%, must lower than a 50% chance of death.

This is not to underplay their bravery. This is to state that the level of bravery to face a 1.5% chance of death is extremely high.

[0] https://en.wikipedia.org/wiki/List_of_spaceflight-related_ac... [1] https://en.wikipedia.org/wiki/List_of_Space_Shuttle_missions