236 



BIOLOGICAL EFFECTS OF RADIATION 



Table 5.— Distribtttion of Length of Bodos in Nonirradiated and Irradiated 



Cultures 



Length in units of 



0.5^1 (midpoint of 



class) 



Total . 



8 



9 



10 



11 



12 



13 

 14 

 15 

 16 

 17 



18 

 19 

 20 

 21 



Frequency 

 / 



xf 



x^f 



Accumulated frequency 



Number 



Percentage 



Irradiated t 







7 



18 



42 



50 



74 

 79 

 75 

 51 

 42 



30 

 22 



7 

 3 



500 



■4 

 ■3 



■2. 



-1 







1 

 2 

 3 

 4 

 5 



6 

 7 

 8 

 9 







21 



36 



■ 42 







74 

 158 

 225 

 204 

 210 



180 



154 



56 



27 



1189 





 63 



72 



42 







74 



316 



675 



816 



1050 



1080 



1078 



448 



243 



5957 







7 

 25 



67 



117 



191 

 270 

 345 

 396 



438 



468 

 490 

 497 

 500 



0.0 



1.4 



5.0 



13.4 



23.4 



38.2 

 54.0 

 69.0 



79.2 

 87.6 



93.6 



98.0 



99.4 



100.0 



Mean = 6.290m 



Standard deviation = 1 . 057/x 



Standard error of mean = 0.047^ 



Standard error of st. dev. = 0.033^ 



Mean = 7.189m 



Standard deviation = 1.251m 



Standard error of mean = 0.056m 



Standard error of st. dev. = 0.040m 



