Percent Error Warmup 2

Front

What is Percent Error?

Back

Percent Error is a measure of how inaccurate a measurement is, compared to the true value. It is calculated using the formula: Percent Error = |Estimated Value - Actual Value| / Actual Value x 100%.

Front

How do you calculate Percent Error?

Back

To calculate Percent Error, subtract the actual value from the estimated value, take the absolute value of that difference, divide by the actual value, and then multiply by 100 to get a percentage.

Front

If Bob estimates 230 attendees and there are actually 300, what is the percent error?

Back

Percent Error = |230 - 300| / 300 x 100% = 23%.

Front

An archaeologist estimates a fossil's age at 520 years, but it's actually 500 years. What is the percent error?

Back

Percent Error = |520 - 500| / 500 x 100% = 4%.

Front

Griffin thinks a birthday card costs $4.50, but it actually costs $4. What is his percent error?

Back

Percent Error = |4.50 - 4.00| / 4.00 x 100% = 12.5%.

Front

Jessie estimates her cat's weight at 8 pounds, but it is actually 10 pounds. What is the percent error?

Back

Percent Error = |8 - 10| / 10 x 100% = 20%.

Front

Zed estimates there are 350 chips in a bag, but there are only 210. What is his percent error?

Back

Percent Error = |350 - 210| / 210 x 100% = 67%.

Front

What does the absolute value mean in the percent error formula?

Back

The absolute value ensures that the difference between the estimated and actual values is always positive, regardless of which is larger.

Front

Why is it important to calculate percent error?

Back

Calculating percent error helps to understand the accuracy of estimates and measurements, which is crucial in fields like science, engineering, and finance.

Front

What is the significance of a low percent error?

Back

A low percent error indicates that the estimated value is close to the actual value, suggesting a high level of accuracy in the estimation.