Single situations don't always follow statistical trends. You're right there. The point of statistics is to prove that that result or something very close to it happens often enough that if you roll 100 times, 1,000, 10,000, the trend is consistent for the entire sample.
Every one knows you can't roll half of a hit. Rolling .5 hits means that for every two rolls, it will yield a single hit, on average. You might get five hits in a row, two blanks, another hit, and four blanks, but this is 6-6, and therefore consistent with the trend.
Edited by Engine25