# How many people were born at the same hour as me?

A wonderful dilemma, isn't it?

I recently wondered how many people were born on the same day, at the same hour, and the same second as me. Another question is how many should be born in a hospital at the same time; that's a different problem, but we can get to that later.

Of course, someone has already done these calculations, but I did them in my head without looking anywhere, so now I'll share my method with you.

# Calculations

A very interesting topic, as usual - and since I know how to use my calculator, it helps with the calculations.

## Assumptions:

• Number of people: 40 million
• Distribution of births: linear (utter nonsense)
• Average lifespan: 65 years = 569,400 hours

## Results:

Since there are 40 million people, each of them is in one of those ~600k hours of life. Assuming they are linearly distributed in those hours, dividing 40 million by ~600k will tell us how many people are born in one hour. The result is approximately 70.

### About 70 people were born at the same hour as me, which means roughly 1.17 people in the same minute, and 0.02 in the same second.

0.02 = 2%, which means a 2% probability that someone was born in the same second.

### Of course, I'm talking about Poland.

I experienced this myself - that there are many people born at the same time. At one point, I clicked on a link on a forum to see people born on the same day, and there were quite a few.

# Calculation Errors

It's important to remember that a linear distribution doesn't exist. There are demographic peaks and valleys. Various events can cause a localized increase in the number of births, and even the time of day can influence it. However, the statistics themselves can be thought-provoking.

# Conclusions

I wonder if I'll ever meet someone born on the same day at the same hour?

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