		Pb	Cr	Cd	Cu	As	Mn	Ni
N	Valid	45	45	45	45	45	45	45
N	Missing	0	0	0	0	0	0	0
Mean		5.1130	5.3786	3.0347	4.9827	4.4838	7.0486	5.0803
Std. Deviation		0.21306	0.16430	0.13828	0.08708	0.08825	0.09344	0.12161