Desoutter Delta Wrench 150 Nm, User Manual, Page: 132 / 184

Part Number
Issue
Date
Page 6159937790
12
03/2018
132 / 184
03/2018 132 (184)
Standard deviation:
σ
 
1
1
2





N
x x
N
i
i

Where:
N
x
x
N
i
i

 
1
(population mean)
x
i
= population value
N = number of measurements of the population
Corrected overall standard deviation:
σ
0
 
 
C
0
Where:
C is a function of the number of samples:
Number of samples Coefficient C
3 1.51
4 1.41
5 1.34
6 1.28
7 1.26
8 1.24
9 1.22
10 1.21
11 1.19
12 1.18
13 1.17
14 1.17
15 1.16
16 1.15
17 1.15
18 1.14
19 1.14
20 to 22 1.13
23 to 25 1.12
26 to 31 1.11
32 to 35 1.10
36 to 44 1.09
45 to 51 1.08