ほれ、公式から引用
Consider using -n 30 to get a statistically better idea.

For more detail, you can read about the DiskProver commands in chiapos

What does the ratio of full proofs vs expected proofs mean?

If the ratio is >1, your plot was relatively lucky for this run of challenges.
If the ratio is <1, your plot was relatively unlucky.
This shouldn't really concern you unless your ratio is <0.70 # If so, do a more thorough chia plots check by increasing your -n

まあ、俺の場合は0.8未満を削除したけどな。
不運なplotとはサヨウナラだね。