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Common Birth Dates II (Posted on 2021-11-17) Difficulty: 3 of 5
Common Birth Dates asked for the expected number of pairs of common birth dates for a cohort of 1000 people whose ages were clustered around a certain value.

Now consider a similar question to the traditional birthday problem: If you attend a concert or other event where people tend to be of a similar age, how large would such an event need to be in terms of number of attendees, so that you'd have at least a 50% probability that there would be at least two people born on the exact same day (year, month and day)?

Again to make things specific: assume the standard deviation about whatever the mean age to be is 12 years and it follows a normal distribution.

Again feel free to vary the assumptions about the distribution.

See The Solution Submitted by Charlie    
Rating: 4.0000 (1 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
Puzzle AnswerK Sengupta2022-05-11 21:56:15
One more examinationSteven Lord2021-11-21 14:58:59
explanation of discrepancySteven Lord2021-11-19 10:16:47
analytic attemptSteven Lord2021-11-18 07:29:10
No SubjectSteven Lord2021-11-17 22:25:42
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