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== usage of ''people''==

Why assume that the people choosen are alive? If dead, then "they" aren't people, but corpses. The task clearly states a group of people. However, even if dead, they still had a birthday. -- [[User:Gerard Schildberger|Gerard Schildberger]] ([[User talk:Gerard Schildberger|talk]]) 03:02, 4 November 2013 (UTC)

== years in Algol ==

What does years signify in "%age of years with required common birthdays: 50.71%;" ? --[[User:Walterpachl|Walterpachl]] ([[User talk:Walterpachl|talk]]) 10:36, 4 November 2013 (UTC)

== Meaning of precision ==

I’m not sure what “''Estimating the error in the estimate to help ensure the estimate is accurate to 4 decimal places''” means. My interpretation is that the $\sigma_\mathrm\left\{mean\right\}$ of the estimated frequency is $<1/10000$.

The $\sigma_\mathrm\left\{mean\right\}$ of the distribution of each sample is calculated using the binomial distribution, so it’s is at most $1/2$ (for $p=q=1/2$). We are very near that value. In this case, if we use $\sigma_\mathrm\left\{mean\right\}=\sigma /Sqrt\left(N\right)$ then the number of samples has to be $N=25000000=10000^2/4$.

Most of the examples use $N=50000$, so they don’t have enough precision. On the other hand, $25000000$ is to much, so I run my example in Racket with only $250000$, that gives a $\sigma$ of only $1/1000$.

I think that the description of the task should ask for a clearer goal. For example: “''Do the final simulation with at least 25000000 samples to help ensure the estimate is accurate to 3 decimal places''.”