Calculating Percentage Error Concepts

In this video, Patrick McCarthy from London explains how to calculate percentage error. He begins by defining what an error is, using an example of estimating height. He then demonstrates how to calculate the error by subtracting the actual value from the estimated value. The video continues with instructions on converting this error into a percentage error by dividing the error by the actual value and multiplying by 100. An example calculation is provided, showing that an estimated height of 185 cm, when the actual height is 180 cm, results in a percentage error of 2.78%.

What is the main topic discussed in the video?

• Learning algebra

• Calculating percentage error

• Understanding fractions

• Calculating area

What is an error in the context of this video?

• A mistake in calculation

• A unit of measurement

• A difference between an estimate and the actual value

• A type of mathematical operation

What is the first step in calculating percentage error?

• Multiply by 100

• Calculate the error

• Find the actual value

• Estimate the value

If you estimate a height to be 190 cm but the actual height is 185 cm, what is the error?

• 3 cm

• 15 cm

• 10 cm

• 5 cm

How do you convert an error into a percentage error?

• Multiply the error by the actual value and divide by 100

• Divide the error by the estimate and multiply by 100

• Divide the error by the actual value and multiply by 100

• Add the error to the actual value and multiply by 100

In the example given, what was the estimated height?

• 180 cm

• 185 cm

• 190 cm

• 175 cm

What is the percentage error if the error is 5 and the actual value is 180?

• 1.67%

• 2.78%

• 5.56%

• 3.33%

Why do we multiply by 100 when calculating percentage error?

• To make the error larger

• To express the error as a percentage

• To simplify the calculation

• To convert the error into a fraction

What is the actual height used in the example?

• 185 cm

• 175 cm

• 180 cm

• 190 cm