The consumer price index (CPI) is calculated by averaging the prices of various items after assigning a weight to each item. The following table gives the consumer price indexes for selected years from 1940 through 2002, reflecting buying patterns of all urban consumers, with x representing years past 1900. Find an equation that models these data. If it's necessary, round your calculations to four decimal places.
?
Year
Consumer
Price Index
Year
Consumer
Price Index
1940
1950
1960
1970
14
24.1
29.6
38.8
1980
1990
2000
2002
82.4
130.7
172.2
179.9
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Source: U.S. Bureau of the Census
?
A. 
B. 
C. 
D. 
E. 
Answer: A
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