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On average every day there are 1.9 million people celebrating their birthday. That is the total global population (7 billion) divided by the number of days in a year (365).

Q: How many people share your birthday?

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no

If there are 300,000,000 people in the US, then on average you share your birthday with over 82,000 people. Of course, if your birthday is 2/29, you would share it with about 1/4th of that number.

Everyone shares their birthday with someone or another.

367

For the chance to be at least 50% that two people share the same birthday, there needs to be 22 people. For the chance to be exactly 100% that two people share the same birthday, there needs to be 366 people. If there was 365 people, there would be a very small chance that each person in the room would have different birthdays. With 366 people, there are not enough individual days for every person to have a different birthday, so there has to be at least one pair.

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Approxiamately six million people are born share a birthday so if you were born on that day you share your birthday with about six million people.

There cannot be a definite answer. There can only be a probabilistic answer of the number of people who might be expected to share a birthday. However, in order to do that it is necessary to know how many people there are in the school. And since you have not bothered to share that crucial bit of information, I cannot provide a more useful answer.

At least 100 all over the world.

estimating about 5000

A person shares their birthday with at least nine million different people around the world.

On average, in the entire world about twenty eight thousand people will have the same birthday as one another. In a room full of people, there should be two people who have the same birthday.

Let's see. Given the fact that a baby is born every 3 seconds, and there are 86,400 seconds in a day, we divide that and we get 28,800. So 28,800 people in the world share the same birthday as you do :)

The probability that 25 random people don't ALL share the same birthday is: 1 - (1/365)**24, or about 0.999999999999999999999999999999999999999999999999999999999999968 However, I suspect you meant to ask "What is the probability that 25 random people all have different birthdays?" That is: 1 * (364/365) * (363/365) * (362/365) * ... * (342/365) * (341/365) = 0.4313 So about 43% of the time nobody will share a birthday, and 57% of the time, two or more people will share a birthday.

Sonnay and alex are bored

23. The probability that at least two people in a room share a birthday can be expressed more simply, mathematically, as 1 minus the probability that nobody in the room shares a birthday.Imagine a fairly simple example of a room with only three people. The probability that any two share a birthday is :1 - [ 365/365 x 364/365 x 363/365]i.e. 1-P(none of them share a birthday)=1 - [ (365x364x363) / 3653 ]=0.8%Similarly,P(any two share a birthday in a room of 4 people)= 1 - [ 365x364x363x362 / 3654 ] = 1.6%If you keep following that logic eventually you getP(any two share a birthday in a room of 23 people)=1 - [(365x364x...x344x343) / 36523 ] = 51%

No. Unless they are blood-related to you (twins).

How many people have the birthday of March 23 in the world?