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How do accuracy and precision of measurement affect calculated values and percent error?
The more precise your instruments of measurement are, the less percentage of error you will have.
Find the greatest possible error and the percent error for each measurement 3cm 6cm 36.85g?
.5cm/.5cm/.005g
What are percent errors?
A percentage error for a measurement is 100*(True Value - Measured Value)/True Value.
What is the percent error of 4cm?
A percent error depends on the size of the measurement as well as the error itself. It's very intuitive to think about: If you're measuring a piece of paper and you're off by 4 cm, you'll have problems; if you're measuring the moon, that's nothing. A bigger percent error is a bigger deal to an engineer. You can calculate it the same way as any percentage: Divide the error by the total length of the measurement, then multiply by 100 to convert it from a proportion to a percentage.
How do you calculate the mean absolute percent error with a 0 actual value?
By definition of percent error, you can't. But you can approximate zero instead, with the number of decimals appropriate to the accuracy of the measurement, e.g. 0.01, 1E-100, etc.
