Data
Data |
|
1 |
223 |
2 |
200 |
3 |
154 |
4 |
217 |
5 |
223 |
6 |
157 |
7 |
178 |
8 |
159 |
9 |
747 |
10 |
243 |
11 |
325 |
12 |
298 |
From the data above the mean of the 12-month data is calculated as
and standard deviation as
s=160.392
since within 2 standard deviations it is considered as usual value hence
value at -2 standard deviations is
260.333-2*160.391
=-60.451
and also value at +2 standard deviation as
260.333+2*160.391
=581.117
hence all values except 9th month that is 747 appear abnormal
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