Final answer:
The purpose of the statistic in the passage is to support a claim. Statistics provide objective evidence that adds credibility to the thesis of an argumentative essay or any rhetorical work. Additional ways to support claims include using expert quotes, anecdotes, and widely accepted facts.
Step-by-step explanation:
The purpose of the statistic in the passage from The Code Book is primarily supporting a claim. In the context of an argumentative essay or a rhetorical piece, statistics are used as concrete evidence to bolster an author's assertions. The use of statistical data is a powerful way to lend credibility to a thesis, as numbers and data can provide objective support to otherwise subjective points.
Other forms of evidence that can effectively support a thesis include quoting authoritative sources, summarizing or paraphrasing expert opinions, adding relevant anecdotes or examples, as well as citing widely accepted facts. These methods of backing up claims are critical to creating a persuasive and logical argument that can stand up to scrutiny. In argument writing, it's also essential to ensure that statistics used are contextually appropriate and accurately interpreted to maintain the writer's credibility.
Subsequent body paragraphs should continue to draw upon such evidence, weaving together facts, expert statements, and analysis to build a convincing and unified argument throughout the essay.