SOLUTION: The percentage of the U.S. population that is foreign born are listed in the table year / Percent ___________ ___ 1950 / 6.9 1960 / 5.4 1970 / 4.8 1980 / 6.2 1990

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: The percentage of the U.S. population that is foreign born are listed in the table year / Percent ___________ ___ 1950 / 6.9 1960 / 5.4 1970 / 4.8 1980 / 6.2 1990      Log On


   

Question 327120: The percentage of the U.S. population that is foreign born are listed in the table
year / Percent
_______________
1950 / 6.9
1960 / 5.4
1970 / 4.8
1980 / 6.2
1990 / 7.9
2000 / 10.4
Let f(t) represent the percentage of the U.S. population that is foreign born t years since 1950. Find a reasonable quadratic model for f(t).
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
I plotted the points in Excel and use their polynomial trendline fitting routine.
y=0.0052x%5E2-20.521x%2B20195
where x is the year, y is the percentage.
R%5E2=0.986