The scientific productivity of major world cities was the subject of a recent study. The study determined the number of scientific papers published between 1994 and 1997 by researchers from each of the 20 world cities, and is shown below. City Number of papers City Number of papers City 1City-23 2City-25 3City-19 4City-25 5City-9 6City-9 7City-19 8City-2 9City-10 10City-16 11City-18 12City-14 13City-27 14City-3 15City-20 16City-18 17City-11 18City-8 19City-9 city20- 22 Construct a 95% confidence interval for the average number of papers published in major world cities.