Two students measured the length of a pencil five times each
PHYSICS · Single correct · CBSE · Physics · Units and Measurements · Units and Measurements
Problem
Two students measured the length of a pencil five times each.
Data set I (cm): 10.2, 10.1, 10.3, 10.2, 10.2
Data set II (cm): 10.5, 9.9, 10.6, 10.0, 9.8
Both data sets give nearly the same mean length. Which statement about their precision is correct?
(a) Both data sets are equally precise because their means are almost equal.
(b) Data set II is more precise because its readings span a wider range.
(c) Data set I is more precise because its readings deviate less from the mean.
(d) Precision depends only on the number of readings, so neither set is more precise.