Question

give an example of how a person could make a "mistake" or "human error" while taking a length measurement.

Answer 1

paradoxical error could be one. Uncertainty of course. the distance between two marks could be up for interpretation whether its great or less than .5 etc.

Answer 2

There are many types of errors:

Systematical errors:
#Personal error: Made by the human himself by his biases of measuring.
#Imperfection error: Due to external factors...Heat, expansion, pressure.
#Instrumental error: Error by the instrument. (Zero error) Wrong least count....

Random errors:
As the name suggests these are the other errors that can cause inaccuracy in measuring a length or something else.

Understood? :)

Answer 3

For example with read the numbers fall !
When you do a work perhaps you have a little or a big mistake .
The mistakes are always there is for human !