So I sowed some Bodacious corn about 10 days ago, in 4 rows of 15' each, one 12" spacings, 3 seeds per hole.
3.5 rows emerged by day 7, but there was half a row with absolutely nothing going on. The other 3.5 rows were all coming up in 2s and 3s, and everything was in sync, and all about the same height.
I've been watering with a sprinkler, so everyone gets the same water, and no one's been walking on that row, but I was still missing 8 sets.
With a typical 85% germination rate, the odds of getting nothing in one hole is about 1/3 of 1%.
With 64 holes, the odds of getting at least one hole somewhere with nothing growing is about 20%
The odds of having 8 holes in a row with nothing drops down to 10^-20, or lower than the odds of me winning the lottery twice in a row.
Then I remembered who was helping me that morning. "Hey son, remember when we sowed the corn seed last Saturday?"
"Did you put seeds in that whole row?"
"?????. Why not?"
"I got tired."
The odds of a 7-yr-old getting distracted in the garden: about 95%.
edit: updated the math