The most rapid increases in average longevity at birth occurred ...

[tnt_battle]

The most rapid increases in average longevity at birth occurred in the first half of the 20th century largely due to
 
  a. a reduction in maternal smoking.
  b. an increase in maternal mortality.
  c. declines in infant mortality rates.
  d. lack of access to childhood immunizations.

Question 2

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.

[mohan]

Answer to Question 1

ANSWER: c

Answer to Question 2

ANSWER: c

[tnt_battle]

Thank you!

[mohan]

Always glad to help...