(a) Explain the difference between precision and accuracy, illustrating your answer
with sketches as appropriate.
(b) A person uses a set of spring-based (analog) bathroom scales to measure his
weight. He gets on and off the scales 10 times and obtains the following
measurements (in kilograms):
70.1, 69.6, 69.4, 70.4, 69.9, 69.6, 70.2, 70.7, 69.4, and 69.7.
He then uses a set of calibrated electronic scales to measure his weight that, for
the purposes of this exercise, are assumed to have zero error. These scales give
a reading of 70.5 kg.
Calculate (i) the precision of the spring-based scales and (ii) their inaccuracy.