Age and Income The 2008 median annual income of householders for certain average ages is given in the table.
a. Find the quadratic function that models the annual income as a function of the average age.
b. Does the model appear to be a good fit?
c. Find and interpret the vertex of the graph of the rounded function.
Average Age (yr) | Median Income ($) | Average Age (yr) | Median Income ($) |
19.5 | 32,270 | 49.5 | 64,349 |
29.5 | 51,400 | 59.5 | 57,265 |
39.5 | 62,954 | 69.5 | 29,744 |
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