I can't imagine it does. To top it off, the numbers seem to be bounded to a very small integer interval. Even if the question was posed as a captcha, a computer could simply keep guessing. This is super-easy to brute force...

At least they enforce a moderation queue. (I asked about the standard deviation not being included as was mentioned by abtinf.)

edit: deleted parent post was discussing the plaintext captcha.

My pardon for the deletion, I reconsidered the observation as off topic.

The original question was:

"I have a question about the Captcha at the bottom, how does a text-based math question help prevent automated submissions?"

You at least have to customize your robot for the site. An off the shelf perl script with www::mechanize and a few regexes probably won't work.