one, two, ten

Whenever you have to do this, consider using the [`BernoulliTrial`](https://github.com/Wikia/app/blob/dev/lib/Wikia/src/Util/Statistics/BernoulliTrial.php#L15-16) class. If you would prefer a static method on that class, let me know.

Minor: Also it would be nice to have something in the PR description that says a little about what you are doing and why.