+35 Jun 30, 2016
3. From the 140 children whose urinary concentration of lead was investigated 40 were chosen who were aged at least 1 year but less than 5 years. The following concentrations of copper were found. 0.70, 0.45, 0.72, 0.30, 1.16, 0.69, 0.83,0.74, 1.24, 0.77,
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