If the article describes the subject adequately, what is the point of the graphic? I found the interactive graphic more confusing than the description.
Compare and contrast to the clarity of their central limit theorem demonstation [1] vs its wikipedia page [2].
By that, I meant that the article described what the graph was representing, not that the article described the information presented adequately. Also, I absolutely disagree with the assumption you made that graphs shouldn't be present if the information is presented in the article. It's good to provide visual demonstrations when applicable in order to help clarify subjects.
Compare and contrast to the clarity of their central limit theorem demonstation [1] vs its wikipedia page [2].
[1] http://blog.vctr.me/posts/central-limit-theorem.html
[2] http://en.wikipedia.org/wiki/Central_limit_theorem