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How many in a group have same birthday?
two people
You can test it and see mathematical probability in action! The birthday paradox, also known as the birthday problem, states that in a random group of 23 people, there is about a 50 percent chance that two people have the same birthday.
How many people have two people with the same birthday?
In a room of just 23 people there’s a 50-50 chance of at least two people having the same birthday. In a room of 75 there’s a 99.9\% chance of at least two people matching.
How large a group of people do we need to consider to be certain that two members of the group have the same birthday?
The magic figure of 20 comes in – in fact it’s 23 – when the probability of having two people with the same birthday reaches 50/50. Put another way, if we selected many groups of 23 people we could be sure that half of the groups selected would contain two people with the same birthday.
What are the odds of meeting someone with the same birthday as you?
One person has a 1/365 chance of meeting someone with the same birthday. Two people have a 1/183 chance of meeting someone with the same birthday. But! Those two people might also have the same birthday, right, so you have to add odds of 1/365 for that.
How many people in a group of N have the same birthday?
The problem is to compute an approximate probability that in a group of n people at least two have the same birthday. For simplicity, variations in the distribution, such as leap years, twins, seasonal, or weekday variations are disregarded, and it is assumed that all 365 possible birthdays are equally likely.
What is the probability of people sharing a birthday?
By assessing the probabilities, the answer to the Birthday Problem is that you need a group of 23 people to have a 50.73\% chance of people sharing a birthday! Most people don’t expect the group to be that small. Also, notice on the chart that a group of 57 has a probability of 0.99. It’s virtually guaranteed! Don’t worry.
What is the percentage of two students having the same birthday?
This Birthday paradox calculator gives results in percentage. Just copy and paste the below code to your webpage where you want to display this calculator. In a class of 23 students, there is a 50\% chance of two students having the same birthday.
How many people in a room can have the same birthday?
23 people. In a room of just 23 people there’s a 50-50 chance of at least two people having the same birthday. In a room of 75 there’s a 99.9\% chance of at least two people matching.