Castle Island Pier 

 Interior Piles 

 Normal Distribution 



ol I I 1 I I L__l 



Mean = 11.387 



Standard Deviation = 1.252 



1—1 I I 



10 12 



Diameter (in) 



14 16 18 20 



Figure 13. Frequency and probability distribution — 

 Castle Island Pier. 







MBTA Bridge 











Mean= 12.172 



0.5 





Interior Piles 

 Normal Distribution 





Standard Deviation = 8.813 



171 



0.4 



- 







J 



\ 



1 







1 





V 





I °' 3 

 O 



- 













o 















u 0.2 



3 















£ 







/ 





\ 





0.1 















I 









1 1 1 1 1 1 1 



■ .it?' 



1 



J_ 



_L 



TVJ 1 1 1 1 1 



10 12 14 16 



Diameter (in) 



Figure 14. Frequency and probability distribution- 

 MBTA Bridge. 



17 



