Changing replicate count does not remove the exact spread gate. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Two replicates still have a mean and half-range
2 readings, 10 and 12, give mean 11 and half-range 1. The pass bit is 1.
rˉ=11,h=1≤2
Four replicates can land exactly on the limit
4 readings have mean 11 and half-range 3. The limit is also 3, so the pass bit is 1.
h=3=3,A=1
A wider four-replicate set fails before reporting
4 readings still produce mean 12, but half-range 6 exceeds limit 3. The pass bit is 0.