1.5
2.2
3.7
7.5
11
15
22
37
45
1710
1720
1730
1750
1760
5.0
4.44
3.89
2.78
2.22
1725
1770
4.17
1.67
N =
=
2π
(
N 60
)
(1-S)
T
Ns 60
P"=
1-S2 1-S1
3
1-0.03 1-0.04
≒1.013≒1.03