Question

The length of a block was measured 10 times. The mean value of the length was 15.4 cm with a standard deviation of 1.5 cm. The relative error was

Answer 1

By definition, relative error is

$\delta = \frac{absolute \; error}{measured \; value}$ , absolute error this case is 1.5, measured value is 15.4.

$\delta = \frac{1.5}{15.4}=0.097 = 9.7\%$

Answer: $9.7\%$