Computing the average longevity of people currently 50-years-old
A) includes all people born in that particular year 50-years-ago.
B) results in the same estimate of longevity as that calculated from birth.
C) does not include anyone who was born in the same year but died before age 50.
D) is not mathematically possible.

Question

Quizplus · Accepted Answer

Computing the average longevity of people currently 50-years-old does not include anyone who was born in the same year but died before the age of 50. Therefore, it is not the same as calculating the average lifespan from birth.

Computing the Average Longevity of People Currently 50-Years-Old