Hi,

I don't have a clue to the correct way of attempting this question:

Eight measurements of the volume of a block of iron had a mean value of 26.52cm3 and a mean square deviation 0.025cm6.

Fifteen measurements of a block of aluminium gave the corresponding values 8.72cm3 and 0.058cm6.

If the density of iron is 7.88g/cm3 and of aluminium is 2.70g/cm3, what is the best estimate of the total mass of the two blocks and of the precision of the method of measurement?