34 



SUMMARIZATION OF DATA 



Ch. 2 



(Data from Current Population Report, Population Estimates, August 10, 1950, 

 Bureau of the Census.) Numbers are thousands. 



Age Class 



1940 



1950 



1960 



9. Change the top and bottom classes in problem 8 to 0-4 and 75-79, and then 

 compute fi and md. Which do you consider the better average here? 



10. Given the following frequency distribution of the minimum annual tem- 

 peratures in 116 cities of Kansas, compute the arithmetic mean and the stand- 

 ard deviation: 



Am. -25.7°, 4.4°. 

 11. Given the following table of average lengths of growing season for ninety- 

 five Kansas counties, compute the mean length of growing season, and also 

 the median length. Which would be the most descriptive average here? 



S(/) - 95 



