Project Gutenberg has a lot of out of copyright works. I did a search for titles that contained the word "statistics", just for curiousity. There were four, and a curious four at that.
I wasn't surprised that one dealt with astronomy:
Charlier, Carl Vilhelm Ludvig, 1862-1934 [Author] Lectures on Stellar Statistics
A book with statistics on various religions also makes sense:
Hayward, John, 1781-1869 [Author] The Book of Religions
Comprising the Views, Creeds, Sentiments, or Opinions, of All the Principal Religious Sects in the World, Particularly of All Christian Denominations in Europe and America, to Which are Added Church and Missionary Statistics, Together With Biographical Sketches
The remaining two were a double surprise. First, both dealt with lynching, a topic we mercifully no longer have close at hand. The second surprise was that the author of these was Ida B. Wells. I knew there was an Ida B. Wells public housing project in Chicago, but had never given much thought to the person it was named after.
Wells-Barnett, Ida B., 1862-1931 [Author]
Mob Rule in New Orleans: Robert Charles and His Fight to Death, the Story of His Life, Burning
Human Beings Alive, Other Lynching Statistics
The Red Record: Tabulated Statistics and Alleged Causes of Lynching in the United States
Ida B. Wells had a long and varied career as an activist; there's more information at the link..
Interestingly, there is not a single title on statistical methods.