FREQUENCY HISTOGRAM: NUMBER OF DIVES PER SIX HOUR 



SUMMARY PERIOD 

 ALL PTTS 



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23:16-05:15 GMT (1) X=269 SD=158 N = 86 

 05:16-11:15 GMT (2) X = 262 SD = 154 N = 88 

 11:16-17 15 GMT (3) X = 262 SD = 155 N = 76 

 17:16-23.15 GMT (4) X = 286 SD=173 N = 51 



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NUMBER OF DIVES 



Figure 42. The frequency histogram of the number of dives during 6-hour summary periods 

 for all 1990 PTTs combined (#823, #825, #827, #831, #833, #839, #840). Note: x = mean 

 number of dives during the designated period; sd = standard deviation of the mean; N = 

 # of summary periods from which the histogram was generated. 



73 



