Calculating Percent Error Effectively

Why are measurements taken with a measuring device always approximate?

• Because the device is always faulty

• Because the object being measured changes

• Due to potential calibration issues and human error

• Due to environmental factors

What is the error in measurement if the measured value is 25.69 grams and the actual value is 24.75 grams?

• 0.94 grams

• 1.24 grams

• 0.74 grams

• 1.94 grams

How do you calculate the error in a measurement?

• Measured value plus actual value

• Measured value multiplied by actual value

• Measured value divided by actual value

• Measured value minus actual value

What is the percent error if the measured value is 25.69 grams and the actual value is 24.75 grams?

• 3.8%

• 2.8%

• 4.8%

• 1.8%

What does a positive error indicate?

• The measured value is equal to the actual value

• The measured value is not reliable

• The measured value is more than the actual value

• The measured value is less than the actual value

If a student measures the length of a pencil to be 23.65 cm but the actual length is 24.30 cm, what is the error?

• 0.85 cm

• 0.55 cm

• 0.75 cm

• 0.65 cm

How do you express percent error?

• As a ratio

• As a decimal

• As a percentage

• As a fraction

What is the percent error if the measured value is 9.30 ml and the actual value is 9.40 ml?

• 1.1%

• 3.1%

• 2.1%

• 0.1%

In the example of measuring the density of water, what was the percent error if the measured density was 1.15 g/ml and the actual density was 1.0 g/ml?

• 20%

• 10%

• 25%

• 15%

How do you calculate the average measured value from multiple trials?

• Sum of all trials minus the number of trials

• Sum of all trials plus the number of trials

• Sum of all trials multiplied by the number of trials

• Sum of all trials divided by the number of trials