Density is a weight per unit volume calculation.
There could be different alloys or casting methods with subtle differences in density, or temperature variations in expansion and density. However:
Every cubic centimeter of lead weighs 11.34 grams.
Every cubic centimeter of iron weighs 7.86 grams.
Thus, the density of lead (11.34 g/cc) is greater than iron (7.86 g/cc).
This is independent of the actual weight and volume of the sample.
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An alloy of iron and lead.
Iron is magnetic, lead is not.
Providing of course that a sample is representative of the population from which it is drawn, the bigger it is the more likely it will be to lead to a valid conclusion. Therefore, the best sample size when there are no restrictions, as in this case, would be one of 1000.
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Lead is more dense than feathers. It doesn't matter how much you have of either one. A chip of lead is more dense than a 10-mile convoy of trucks loaded with feathers.