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Common Birth Dates (Posted on 2021-09-29) Difficulty: 2 of 5
It has been noted that Roger Ebert and Paul McCartney were born on the same day (year, month and day). How many such coincidences should you expect?

To make things specific, assume there are 1000 celebrities of such stature and recency, and that whatever their average age is, the standard deviation of their ages is 12 years and follows a normal distribution. Of course the date is rounded to the day; don't worry about the hours.

Feel free to vary the assumptions for bonus answers.

See The Solution Submitted by Charlie    
Rating: 4.3333 (3 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
An interesting extensionMath Man2021-10-02 19:01:59
On the age distributionJer2021-10-02 17:14:57
Another rough estimateSteve Herman2021-10-02 09:54:35
Some ThoughtsRough estimateJer2021-10-01 09:00:11
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