The summary page closes the chain from calibration rows to true probabilities
to observed expected counts. Here the rows 9/10, 1/10 and 1/5, 4/5 produce
observed probabilities 29/40 and 11/40 that still add to one; real summaries
must cite calibration runs, shot noise, and threshold drift.
The final readout budget ties calibration rows, true probabilities, and expected counts together. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
The matrix rows came from calibration counts
Calibration rows 9/10, 1/10 and 1/5, 4/5 are reused in the prediction.
A=[1095110154]
The displayed budget is closed
Observed probabilities 29/40 and 11/40 add to 1 and match 40 expected shots.