[tex]\displaystyle \frac{|1.57-1.6|+|1.58-1.6|+|1.63-1.6|+|1.61-1.6|}{4}=\frac{|-0.03|+|-0.02|+|0.03|+|0.01|}{4}=\frac{0.03+0.02+0.03+0.01}{4}=\frac{0.09}{4}=0.0225[/tex]