Percent Error Practice

Front

What is percent error?

Back

Percent error is a measure of how inaccurate a measurement is, expressed as a percentage of the actual value. It is calculated using the formula: Percent Error = |(Measured Value - Actual Value)| / |Actual Value| × 100%.

Front

How do you calculate percent error?

Back

To calculate percent error, subtract the actual value from the measured value, take the absolute value of the result, divide by the actual value, and then multiply by 100 to get a percentage.

Front

If you estimate a value of 50 and the actual value is 60, what is the percent error?

Back

Percent Error = |(50 - 60)| / |60| × 100% = 16.67%.

Front

What is the percent error if the measured value is 25 and the actual value is 20?

Back

Percent Error = |(25 - 20)| / |20| × 100% = 25%.

Front

Why is it important to calculate percent error?

Back

Calculating percent error helps to assess the accuracy of measurements and can indicate the reliability of experimental results.

Front

What does a negative percent error indicate?

Back

A negative percent error indicates that the measured value is less than the actual value.

Front

What does a positive percent error indicate?

Back

A positive percent error indicates that the measured value is greater than the actual value.

Front

If a student measures the length of a table as 150 cm, but the actual length is 145 cm, what is the percent error?

Back

Percent Error = |(150 - 145)| / |145| × 100% = 3.45%.

Front

What is the percent error for a measurement of 8.5 when the actual value is 10?

Back

Percent Error = |(8.5 - 10)| / |10| × 100% = 15%.

Front

If the actual value is 200 and the measured value is 180, what is the percent error?

Back

Percent Error = |(180 - 200)| / |200| × 100% = 10%.