2.8 - Percent Error

2.8 - Percent Error

​Learning target: I will solve problems involving percent error.

​Review questions are next.

Multiple Choice

Amy deposits $200 in the bank for 5 years. She earns 5% interest. How much did she make in interest?

• $10

• $60

• $50

• $500

Multiple Choice

Howard borrowed $4,000 from the bank at an interest rate of 8%. He has to pay it back in 2 years. How much interest will he pay?

• $640

• $64

• $74

• $460

Multiple Choice

What is the equivalent decimal to 14%?

• 0.14

• 1.4

• 14.00

• 0.014

Math Response

What is the percent error of Doug's estimate?

Round to the nearest tenth, if necessary.

$$Percent\ Error:\frac{|actual−estimate|}{\ actual}=\frac{\%}{100}$$

Type answer here

Correct Answer: 30

Deg^°

Rad

Math Response

What is the percent error of Doug's estimate?

Round to the nearest tenth, if necessary.

$$Percent\ Error:\frac{|actual−estimate|}{\ actual}=\frac{\%}{100}$$

Type answer here

Correct Answer: 52.4

Deg^°

Rad

Multiple Choice

Find the percent change.
Original amount:  10
New amount: 12

• 20%
• 12%
• 15%
• 50%

Explanation Slide...

Amount of error : = 12Actual amount : 48Percent error :

Multiple Choice

Mr. Sheridan estimates it will take him 60 minutes to run 8 miles. It actually takes him 48 minutes. What was the percent error in his estimation?

• 8%

• 12%

• 20%

• 25%

• 80%

Explanation Slide...

Estimated amount : 10Actual amount : 50Amount of error : Percent error :

Multiple Choice

Mr. J planned for about 10 people to come to his party, but then 50 people came. What is the percent error in his estimation?

• 5%

• 20%

• 80%

• 400%

• 500%

Multiple Choice

Zed went to the store and bought a bag of chips.  He estimated there would be 350 chips in the package, but realized there were only 210 chips in that package.  What was his percent error?

• 35%
• 67%
• 85%
• 92%

Multiple Choice

The students measured length during a science experiement, they got 12 cm. But the actual measurement was 14.25 cm. What was the percent error?

• 15.79%
• 18.75%
• 2.25%
• 18%

Multiple Choice

The attendance for the basketball game was estimated to be 15,000 people but 12,500 people attended. What was the percent error?

• 16.67%
• 20%
• 2500%
• 80%

Multiple Choice

Jessie estimates the weight of her cat to be 8 pounds.  The actual weight of the cat was 10 pounds.  Find the percent error.  

• 15%
• 20%
• 25%
• 30%

Multiple Choice

Bob estimates that there will be 230 people who attend the concert.  There was an actual total of 300 people who attended.  Find the approximate percent error.  

• 23%
• 33%
• 27%
• 37%

Multiple Choice

An archaeologist estimated that a fossil was 520 years old. It was actually 500 years old. What was the percent error?

• 4%
• 20%
• 3.8%
• none of these

Multiple Choice

You are purchasing a T.V for $990 T.V with 9% sales tax. What is the final price of the T.V.?

• $ 1881.00
• $ 1079.00
• $ 1,079.10
• $ 1,709.1