Question 1054824
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Hi  
using an excel spreadsheet..any statistical calculator can be used as well.
x	m	(x-m)	(x-m)^2	
60	81	-21	441	
73	81	-8	64	
103	81	22	484	
67	81	-14	196	
89	81	8	64	
76	81	-5	25	
88	81	7	49	
86	81	5	25	
79	81	-2	4	
72	81	-9	81	
88	81	7	49	
87	81	6	36	
968			1518	
81			138	1518/11
			11.747	sqrt(138)  s = 11.7