Keysight Technologies MSO-X 2002A

192 Keysight InfiniiVision 2000 X-Series Oscilloscopes User's Guide
14 Measurements
The mean is calculated as follows:
where:
• x = the mean.
• N = the number of measurements taken.
•x
i
= the ith measurement result.
The standard deviation is calculated as follows:
where:
• σ = the standard deviation.
• N = the number of measurements taken.
•x
i
= the ith measurement result.
• x = the mean.
-2σ
mean
-1σ 1σ
2σ
68.3%
-3σ
95.4%
99.7%
03σ
x
¯
=
∑
i=1
N
x
i
N
σ =
∑
i=1
N
(
x
i
− x
¯
)
2
N