The mass of a 45.750 g piece of copper is measured four times on two different balances with the following results: Trial Balance 1 (g) Balance 2 (g) 1 45.747 45.76 2 45.748 45.74 3 45.744 45.73 4 45.745 45.77 a) Calculate the mean, deviation, % relative deviation, absolute error, and % relative error. Show all Work. b) Which balance is more precise