66 



BELL SYSTEM TECHNICAL JOURNAL 



5 ' 10 ' ' ii' ' 26' ' ' 26 " io 35 40 ~45 50 55 60 6ti " i'6 7i' ' iio' ' '6b' ' 90 



X = Defectives in Universe 



N = 900, 11 = 499 



CHARTS A 



I 



