b.)
( 1950 | 80 )
( 2000 | 212 )
wird zu
( x | y )
( 0 | 80 )
( 50 | 212 )
y = m * x + b
m = Δ y / Δ x = ( y1 - y2 ) / ( x1 - x2 ) = ( 80 - 212 ) / ( 0 - 50 )
m = 2.64
80 = 2.64 * 0 + b
b = 80
n2 ( t ) = 2.64 * t + 80
c.)
( 1975 | 136 )
wird zu
( x | y )
( 0 | 80 )
( 25 | 136 )
( 50 | 212 )
n3 ( 0 ) = a * 0^2 + b * 0 + c = 80 => c = 80
c = 80
625a + 25b + c = 136
2500a + 50b + c = 212
n3 (t) = 0,016·t ² + 1,84·t + 80
d.)
für 2010
t = 60
n1 ( t ) = 80 * 1,01968 ^t
n1 ( 60 ) = 80 * 1.01968 ^60
n2 ( t ) = 2.64 * t + 80
n2 ( 60 ) = 2.64 * 60 + 80
n3 (t) = 0,016·t ² + 1,84·t + 80
n3 ( 60 ) = 0,016·60 ² + 1,84·60 + 80