The ogives shown are based on U.S. Census data and show the average annual personal income per capita for each of the 50 states. The data are rounded to the nearest thousand dollars.

(i) Ogive

(ii) Ogive Showing Cumulative Percentage of Data

(a) How were the percentage shown in graph (ii) computed?
(b) How many states have average per capita income less than 37.5 thousand dollars?
(c) How many states have average per capita income between 42.5 and 52.5 thousand dollars?
(d) What percentage of the states have average per capita income more than 47.5 thousand dollars?

Personal Income per Capita by State 50 49 50 40 35 20 16 10 27.5 32.5 37.5425 52.5 Per capita income ($1000) Personal Income per Capita by State 98% 100% 100 88% 80 40 32% 20 0% 7.5 325 3 7.5 42.5 475 Salary ($1000)