Hi,

 SD = 

x	m	(x-µ)	(x-µ)^2	

20.2	30	-9.80	96.040	

22.4	30	-7.60	57.760	

30	30	0.00	0.000	

37.6	30	7.60	57.760	

39.8	30	9.80	96.040	

150			307.600	sum

30.00		sum/4	76.900	Variance

 

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