Check your intuition: The birthday problem - David Knuffke
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Date: 2020-08-22
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Comments and reviews: 10
Krum
Mathematically sound may be, but these calculations are wrong. There are times of the year when more people are born and times of the year when less people are born, due to seasons, significant events and culture. So, exact calculation of this problem without statistical data from the actual births is simply not possible. I argue that even smaller group of people will produce two with the same birthday, but how small exactly is impossible to calculate. With calculations like those space shuttles explode twice.
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Mathematically sound may be, but these calculations are wrong. There are times of the year when more people are born and times of the year when less people are born, due to seasons, significant events and culture. So, exact calculation of this problem without statistical data from the actual births is simply not possible. I argue that even smaller group of people will produce two with the same birthday, but how small exactly is impossible to calculate. With calculations like those space shuttles explode twice.
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caitlyn
My best friend has the same birthday as me. Our parents met in the same hospital the day I was born, they became friends and then as we grew up we both became best friends. Today we both turn 15. (I turned 15 about 7 hours ago and she turns 15 in around 2 hours. So yeah, I know someone with the same birthday and birth year as me.
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My best friend has the same birthday as me. Our parents met in the same hospital the day I was born, they became friends and then as we grew up we both became best friends. Today we both turn 15. (I turned 15 about 7 hours ago and she turns 15 in around 2 hours. So yeah, I know someone with the same birthday and birth year as me.
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Hilo
Not only did a boy in elementary school had the same exact birthday as me, but my own cousin from my fathers side also has the same exact birthday. Both of them are my age.
(Also this is unrelated but I actually met my cousin as a friend of a friend before I met my cousins father who revealed to us that we were cousins)
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Not only did a boy in elementary school had the same exact birthday as me, but my own cousin from my fathers side also has the same exact birthday. Both of them are my age.
(Also this is unrelated but I actually met my cousin as a friend of a friend before I met my cousins father who revealed to us that we were cousins)
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Dani
It's even more likely when you take into consideration major dates in the human calendar such as holidays. Many people are conceived on dates when alcohol and festivities are prevalent such as New Years, or dates when 'love' is a center feature such as Valentine's, leading to more September-November babies on average.
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It's even more likely when you take into consideration major dates in the human calendar such as holidays. Many people are conceived on dates when alcohol and festivities are prevalent such as New Years, or dates when 'love' is a center feature such as Valentine's, leading to more September-November babies on average.
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Jhony
I am not sure this is right, but if you think about it then, a group of 366 people would already have a 100% chance of sharing a birthday, right? Cause even if each one of the 365 was born in different days of the year, the 366th would have to have been born on a day already occupied.
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I am not sure this is right, but if you think about it then, a group of 366 people would already have a 100% chance of sharing a birthday, right? Cause even if each one of the 365 was born in different days of the year, the 366th would have to have been born on a day already occupied.
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Ela
I actually got the number pretty close, I sad 26 only because in my class there are 26 students and there are 2 girls with the same birthday, and they are best friends!
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I actually got the number pretty close, I sad 26 only because in my class there are 26 students and there are 2 girls with the same birthday, and they are best friends!
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Jane
my family consists of 7 people and 2 of them have the same birthday, same date, same month only different year. Its my mom and my sister, 38 years apart.
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my family consists of 7 people and 2 of them have the same birthday, same date, same month only different year. Its my mom and my sister, 38 years apart.
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TangledHelix
I had 2 classes both were super small, like 6 total each. I shared a birthday with someone in both classes (two different people.
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I had 2 classes both were super small, like 6 total each. I shared a birthday with someone in both classes (two different people.
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Cyrus
But if you randomly generate numbers 1 to 365 23 times, the chance of a match is small. I don't understand how this equation is true.
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But if you randomly generate numbers 1 to 365 23 times, the chance of a match is small. I don't understand how this equation is true.
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Cat
Quite a few people i know including myself share birthdays with other people i know. They are the only birthdays i manage to remember.
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Quite a few people i know including myself share birthdays with other people i know. They are the only birthdays i manage to remember.
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