The number of allowable doubtful digits in a measurement or the result of mathematical operations with measurements is _____.

 

The number of allowable doubtful digits in a measurement or     

the result of mathematical operations with measurements is _____________ .     

 

A properly recorded measurement or calculation should     

contain only one doubtful (estimated or uncertain) digit,     

which is always the last significant figure. This last digit     

represents the limit of the instrument's precision, with all     

preceding digits assumed to be certain.     

_.