Why your intuition fails to predict shared birthdays

Check your intuition: The birthday problem - David Knuffke · 5:07 · Video: TED-Ed · Watch at the source

In short: How many people do you need in a room to make a shared birthday more likely than not? This video explores why our natural instincts often fail us when calculating the mathematical probabilities of coincidence.

The birthday problem demonstrates the surprising gap between human intuition and actual probability. While most people underestimate the likelihood of coincidences, mathematical analysis reveals that the group size required for a greater than 50% chance of two people sharing a birthday is much smaller than expected.

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