The range of values is between about half a million and several tens of millions. However, it is critical to remember that these are 'statistical' lives. We don't know who is going to die, just that someone will.
Humans are no different.
This is categorically untrue. Humans are willing to trade a change in their risk of death for something else they want. By a clear life or death choice, I was referring to the choice between being dead for sure in the next minute, and being alive.