How do you calculate derived uncertainty?
In my chemistry lab, we measured the volume of a block once each with a ruler and a caliper, and the mass of it 3 times. We were also given the actual density ranges. How do I find the derived uncertainty of the densities by ruler and caliper?
Ex:
Ruler : 65cm^3
Caliper : 69.3 cm^3
Mass: 66.35 66.34 66.37
Ruler Density(based on average mass):1.02 g/cm^3
Caliper Density: .957 g/cm^3
Actual Density: .94-.98g/cm^3

Also, how do I find the % error for my ruler and caliper work? Compare the densities to the middle of the actual density range?

Question

How do you calculate derived uncertainty?
In my chemistry lab, we measured the volume of a block once each with a ruler and a caliper, and the mass of it 3 times. We were also given the actual density ranges. How do I find the derived uncertainty of the densities by ruler and caliper?
Ex:
Ruler : 65cm^3
Caliper : 69.3 cm^3
Mass: 66.35   66.34    66.37
Ruler Density(based on average mass):1.02 g/cm^3
Caliper Density: .957 g/cm^3
Actual Density: .94-.98g/cm^3

Also, how do I find the % error for my ruler and caliper work? Compare the densities to the middle of the actual density range?