As of this writing, there have been 42 different presidents of the United States, and four of

Question:

As of this writing, there have been 42 different presidents of the United States, and four of them are alive. Listed below are the numbers of years that they lived after their first inauguration, and the four values with the plus signs represent the four presidents who are still alive. (These values are said to be censored at the current time that this list was compiled.) What can you conclude about the mean time that a president lives after inauguration?