
Only three of
the eight levels of development represent higher technological
civilizations, namely levels 6, 7, 8.
This corresponds to a probability of:
F_{z} = 14,400/7,301 · (1:36+1:49+1:64)
F_{z}= 405,225/3,218,741 = 1:7,943 


F_{Liz}
= F_{L}·F_{i}·F_{z} 
= 1:9
· 1:14 · 405,225/3,218,741
= 0.000,999,171
= 1 : 1001 technological
civilization 

Since
two values exist for F_{e} and Fgae a minimummaximum
statement can also be generated here.
Inserting all values (F_{e} = 0.1) into equation 6.3.3:
N_{ze1} = (100300)·10^{9}
· 1:15,000 · 1:69 · 1:1001
N_{ze1} = 97 – 290
„Earth 2“ with a technological civilisztion
Inserting all values (F_{e} = 0.01) into equation
6.3.3:
N_{ze2} = (100300)·10^{9}
· 1:15,000 · 1:691 · 1:1001
N_{ze2} = 10 – 29
„Earth 2“ with a technological civilisztion
The two results can then be summarized to the following
statement:
6.4.1 Theorem 
There are probably 10 to 290
technological civilizations on an "Earth
2" in a solarlike star system, in our
galaxy. 
The
probability of a habitable "Earth 2", with a
technological civilization, in solarlike star systems,
in our galaxy, is then:
6.4.2 Definition 
F_{ze}
= F_{sph}
· F_{gae }·
F_{Liz} 

F_{ze}= F_{sph}·F_{gae}·F_{Liz}
F_{ze} = 1:15,000 · (1:691:691)
· 1:1001
F_{ze} = 1:1,036,035,000 
10,375,365,000
Only every 1.036 to 10.375 billionth
star system produces an "Earth 2", with a
technological civilization.
