Suppose there are 600 people with fatal disease A. You have to choose between
treatment 1 - 200 people will be saved
treatment 2 - there is a 1/3 chance everyone is saved, a 2/3 chance everyone dies
Now suppose there are 600 people with fatal disease B. You have to choose between
treatment 3 - 400 people will certainly die
treatment 4 - there is a 1/3 chance everyone is saved, a 2/3 chance everyone dies.
What choices do you make?