Exploring Percent Error and Percent Change

The video reviews percent error and percent change, providing examples to illustrate each concept. It explains how to calculate percent error using Fred's party attendance and percent change with Fred's party attendance over two years. A state test question is used to demonstrate percent change, and a final example with Bob's prediction of home runs illustrates percent error. The video emphasizes understanding the difference between absolute error/change and percentage representation.

Fred estimated 20 people would attend his party, but 25 actually attended. What was the percent error?

• 10%

• 30%

• 20%

• 25%

What is the formula for calculating percent error?

• Original / Change = Percent / 100

• Actual / Error = Percent / 100

• Change / Original = Percent / 100

• Error / Actual = Percent / 100

Fred's party attendance increased from 10 people last year to 25 people this year. What is the percent change?

• 200%

• 150%

• 100%

• 250%

What is the formula for calculating percent change?

• Actual / Error = Percent / 100

• Change / Original = Percent / 100

• Error / Actual = Percent / 100

• Original / Change = Percent / 100

Last year, 950 people attended a parade, and this year, 1520 people attended. What is the percent increase?

• 70%

• 80%

• 60%

• 50%

What is the change in attendance from last year to this year in the parade example?

• 700

• 600

• 650

• 570

Fred originally had 2 cats and adopted 5 more. What is the percent change in the number of cats?

• 250%

• 350%

• 300%

• 200%

In the example with Fred's cats, what is the original number of cats?

• 7

• 2

• 10

• 5

Bob predicted the Mets would hit 5 home runs, but they actually hit 3. What is the percent error?

• 66.6%

• 50%

• 33.3%

• 75%

In the example with Bob's prediction, what is the actual number of home runs hit?

• 5

• 4

• 3

• 2