A student is measuring the diameter of a piece of wire with a micrometer. Her readings are
0.27 mm, 0.29 mm, 0.26 mm, 0.42 mm, 0.26 mm.
Which of the following is the best mean value for the diameter of the wire, stated with a
suitable uncertainty?
A 0.30 ± 0.08 mm
B 0.27 ± 0.08 mm
C 0.27 ± 0.02 mm
D 0.267 ± 0.015 mm