# Inherent error in mass and volume?

In one of my chem classes I had to do a lab that involved finding the mass and volume of a substance. I did three trials and for my mass I got 9.3g, 9.3g, and 9.4 g. For my volume, I got 9.7ml, 9.9ml, and 9.9 ml.

I am being asked to find the inherent instrument error calculation.

For volume, I used a graduate cylinder which has 1 % vol/reading as an inherent error.

For mass I used a one place electronic balance which has error of 0.1g/reading

How would I find the error in mass and the percent error in mass?