Agilent Technologies InfiniiVision 5000 Series User's Guide Page 196

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196 5000 Series Oscilloscope User’s Guide
4 Making Measurements
The mean is calculated as follows:
where:
x
= the mean.
N = the number of measurements taken.
x
i
= the i
th
measurement result.
The standard deviation is calculated as follows:
where:
σ = the standard deviation.
N = the number of measurements taken.
x
i
= the i
th
measurement result.
x
= the mean.
-2s
mean
-1s 1s
2s
68.3%
-3s
95.4%
99.7%
03s
x
x
i
i 1=
N
N
--------------=
σ
x
i
x()
2
i 1=
N
N 1
------------------------------=
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