Calculating Percent Error and Percent Change

The video tutorial explains how to calculate percent error and percent change using practical examples. It begins with a scenario involving guessing the number of marbles in a jar to illustrate percent error calculation. The formula for percent error is given as the error divided by the actual amount, and the example shows how to convert this to a percentage. The tutorial then shifts to percent change, using a price change example to demonstrate the calculation. The formula for percent change is the new amount minus the original amount, divided by the original amount, and the result is converted to a percentage. The video concludes with a brief mention of related pre-algebra skills.

What is the initial problem presented in the video?

• Calculating the volume of a jar

• Guessing the number of marbles in a jar

• Determining the color of marbles

• Finding the weight of marbles

If you guessed 83 marbles but there are actually 80, what is the error?

• 1 marble

• 3 marbles

• 2 marbles

• 5 marbles

How do you calculate percent error?

• Error divided by the guessed amount

• Error divided by the actual amount

• Guessed amount divided by the error

• Actual amount divided by the error

What is the percent error if the error is 3 and the actual amount is 80?

• 30%

• 3.75%

• 0.375%

• 37.5%

What is the original price of the item in the percent change example?

• $52

• $12

• $40

• $30

How do you calculate percent change?

• New amount minus original amount divided by the new amount

• Original amount minus new amount divided by the original amount

• New amount minus original amount divided by the original amount

• Original amount minus new amount divided by the new amount

What is the change in price in the percent change example?

• $30

• $52

• $40

• $12

What is the percent change if the price changes from $40 to $52?

• 30%

• 15%

• 25%

• 20%

What would indicate a percent decrease in the percent change calculation?

• A negative result

• A positive result

• A result less than 1

• A result greater than 1

Where can you find additional resources for pre-algebra review?

• In the video description

• In the textbook

• In the pre-algebra review video

• On the teacher's website