A scale that reads zero when nothing is on it means
that the scale reads that there is nothing on it. Statement a is not biased. A stopwatch
that stops immediately when the stop button is clicked means that there is no
delayed reaction of the stopwatch. It corresponds exactly as it is pressed. Statement
b is not biased. A balance that always reads 0.01g means that the balance is
not set to zero or it is damaged. If no matter how heavy ythe object is, the
balance reads 0.01g, the measurement is not accurate anymore. Statement c is
biased.
