+3
s
-3
s
+2
s
-2
s
+1
s
-1
s
A.
Normal Error Curve
•
68.3% of
measurements will
fall within ±
s
of the
mean.
m
x
i
Relative frequency, dN / N
•
95.5% of measurements
will fall within ± 2
s
of
the mean.
•
99.7% of measurements
will fall within ± 3
s
of
the mean.
