Answer:
Reality
Step-by-step explanation:
Both poems "A Contribution to Statistics" and "And Yet the Books" both depict different events in the middle of the poem, but in the end imply that there is something constant which is reality. Both display smaller fragments of events, stories, or examples, but the last lines of how stories and ideas go, and how numbers give statistics to some instances, give the general idea that the ups and downs of the poem all end up to one final reality.