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An estimated 2011 world Birth Rate was about 4 births per second
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What is the probability of twenty-two consecutive same gender births?
Assuming that the chance of a woman giving birth to a boy or a girl is the same (in reality there's about 105 boys born for every 100 girls) then the probability of 22 of the same gender births *in a row* is: P=(0.5)^22=0.0000002384 or 1 in 4,194,304 It depends on the "when" of the question. If you point at a childless woman, and say "She will give birth to 22 children. What is the likelyhood that they will all be girls?" In that case the probability will be one in two-to-the-twenty-second. Pretty long odds. BUT, if you point at a woman with twenty one children, and ask "What are the odds that the next one will be a girl?" Then the answer is one in two. Make sense?
What is the probability of the next four births at a hospital being all girls?
Assuming that the births at the hospital are equally likely to be of either gender then the answer is (1/2)4 = 1/16
What is the probability of having 4 boys in 10 births?
25
What does the term vital statistics refer to in statistics?
Births and Deaths
If on an average one birth in 80 is a case of twins what is the probability that there will be atleast one case of twins in a hospital on a day when 20 births occur?
Ans : Probability that there will be at least one case of twins = 1-(79/80)^20
