In 2009 in the UK 7, 81,000 women gave birth. 12,595 had twins. 172 had triplets. Five
had four or more babies.
Estimate the probability of having
(a) Twins
(b) triplet.
Answers
Answer:
Multiple births are much more common today than they were in the past. According to the US Department of Health and Human Services, the twin birth rate has increased by over 75% since 1980, and triplet, quadruplet, and high-order multiple births have increased at an even higher rate. There are more multiple births today in part because more women are receiving infertility treatment, which carries a risk of multiple pregnancy. However, since the first publication in 1998 of the American Society for Reproductive Medicine’s (ASRM’s) Guidelines on Number of Embryos Transferred, the number of treatment-related pregnancies with triplets or more has decreased dramatically. Also, more women are waiting until later in life to attempt pregnancy, and older women are more likely than younger women to get pregnant with multiples, especially with fertility treatment. Although major medical advances have improved the outcomes of multiple births, multiple births still are associated with significant medical risks and complications for the mother and children. If you are at risk for a multiple pregnancy, this booklet will help you learn how and why multiple pregnancies occur and the unique issues associated with carrying and delivering a multiple pregnancy.
Answer:
i. P (twins) = 12595 / 781000 = 229/14200 = 0.0161....
ii. one baby = 781000 - (12595 + 172 + 5) = 768228
P (one baby) = 768228 / 781000
= 0.984