(a)  The arithmatic mean of the observations =0.01265 A 
 (b)  The deviations from the mean are:   
d_1 = 0.00015 A
 d_2 = -0.00045 A
 d_3 = -0.00015 A
 d_4 = 0.00045 A
 d_5 = 0.00025 A
 d_6 = -0.00025 A
 
