Statistical calculation – CITIZEN SR-135NPU User Manual
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7. Statistical calculation.
Example:
(1) What is the average and standard deviation?
Data: 55, 53, 57, 54, 51, 56, 55, 52
Key Input
Display
Note
SD
[SHIFT] [SD]
0
set statistics mode
[5] [5] [DATA]
1
display the volume
[5] [3] [DATA]
2
of input data
[5] [7] [DATA]
3
[5] [4] [DATA]
4
[5] [1] [DATA]
5
[5] [6] [DATA]
6
[5] [5] [DATA]
7
[5] [2] [DATA]
8
[ x ]
54.125
Average of datum
[SHIFT] [
Σx]
433
Total of datum
[SHIFT] [
Σx
2
]
23465
Total of square of datum
[n]
8
Number of input data
[
σ
n–1
]
2.031009601
Standard deviation of
samples (
σ
n–1
)
[x
2
]
4.125
Unbiased of variance
[SHIFT] [
σ
n
]
1.899835519
Standard deviation of
population (
σ
n
)
[SHIFT] [SD]
0
Clear the statistics mode
("SD" clear)