If they are the same 100 people on both years, then it actually is 2 out of 100 getting pregnant in 2 years. In your example the people on year 1 and year 2 are different, making up a total of 200 people... But in real life I suppose most of us are using contraception and having sex for a lot longer time than one year of our lives...
So...
There is a group of 100 people who uses contraception for 20 years.
Each year one of them gets pregnant.
= during 20 years, 20 of them will get pregnant (possibly less if a single person gets pregnant several times)
Comment Reply
If they are the same 100 people on both years, then it actually is 2 out of 100 getting pregnant in 2 years. In your example the people on year 1 and year 2 are different, making up a total of 200 people... But in real life I suppose most of us are using contraception and having sex for a lot longer time than one year of our lives...
So...
March 15, 2013 - 9:19amThere is a group of 100 people who uses contraception for 20 years.
Each year one of them gets pregnant.
= during 20 years, 20 of them will get pregnant (possibly less if a single person gets pregnant several times)
This Comment
Reply