I don't know what the exact odds are but it does happen: My Mum and her older sister are born on the same day 3 years apart, add to the statistical odds of fun I was also born on the same day. Save don't very likely
None.
11.7%. (But when there are 23 people, the odds are 50.7%.) In order for 2 people to have the same birthday, then there can only be 9 different dates out of 365 (actually 37 out of 1461). This is roughly equivalent to 2.53% of possible dates. However, the chance of having matching birthdays to any other birthday is actually much larger, because EACH individual has up to 9 chances out of 365 to match another. The probability is calculated using the product of the series p(n) = 1-(n-1/365), which compares the likelihood of all possible pairs of identical birthdays. The chance that no two share a birthday (including the leap day) can be calculated as the product of the terms n = 1 to 10 of [(1461-(4n+1)/1461]. This should also equate to a likelihood of 88% because the Leap Day is only 1 chance in 1461. (see related link)
There are a few options that are available to see betting odds. This would greatly depend on what odds one is interested in viewing, but one can find betting odds on sites such as Odds Checker, Odds Portal and Odds Shark.
Odds ratio (AD/BC) is the ratio between number of times that something happens and does not happen. Crude odds ratio is the ratio that is not stratified (ex. by age). Adjusted odds ratio is a stratified odds ratio. If the odds ratio equals one, then there is no association, and null hypothesis shall be accepted. If one is included into confidence interval, then it is possible that odds ratio equals one, and it is not statistically significant. If stratified odds ratios are about the same, or there are no significant differences, the odds ratios are combined into one common odds summary estimate of two stratum specific ORs using Mantel-Haenszel and/or Cohran's tests, or multivariable analysis.
1 in 50000?
1 out of 365 These odds improve if she has sex and gets pregnant about 3 months after her birthday.
not very likely
I believe the chances of having the same birthday as one of your parents is: 1 out of 183 and the chances of having the same birthday as both parents is: 1 out of 133,225
Odds deal with sets of numbers. You haven't given a group to work with. For example, the odds of two people having the same birthday approaches certainty with a group of thirty or more, but finding someone with your birthday would require 180, just to give a fifty/fifty chance.
About 1 In 1000 Unless you have twins
There is no simple answer since the times of conception may not be independent events.
Odds Bodkin was born on February 14, 1953.
The odds of having a birthday on a certain day of the year other than February 29 is about 1 in 365.25, which is about 0.274%. 0.274% of the world population, today's estimate of which is 7,050,566,000, is about 19.3 million people.
Believe it or not it happens very often for example three generations of women in my family have the same birthday i am the third generation I've seen it a lot more too so the odds are high. I agree, I am born on my mother's birthday and in school I had several friends who were also born on their mother's birthdays.
Well quite alot of people have their sons birthdays on similar days (1-2 difference) and I wuould say the chances are about 50/50 but that's just my opinion.:)
Last time i heard it was about 1 in every 72 people will have an accident