Percent Error

You estimate that you sent 135 texts last week, but when you get the bill it was actually 108. What was your percent error?

• 20%

• 25%

• -20%

• -25%

You estimate that 200 people attend a school concert. The actual attendance was 240.   What is the percent error?

• 20%

• -20%

• -16.7%

• 16.7%

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

Mr. Nacerino estimates that it will take him 48 minutes to run 8 miles. It actually takes him 60 minutes. What was his percent error?

• 20%

• 12%

• 25%

• 8%

A percent error is how _________ a measurement is compared to the correct measurement

• inaccurate/wrong

• accurate/right

• percent

• increase

Ms. Brown estimated 70 students would try out for the Cross Country team. This year, only 63 students tried out. What was her percent error?

• 11%

• 50%

• 12%

• 1%

You estimate that you sent 135 texts last week but when you get the bill it was actually 108. 

• 20%

• 25%

• 30%

• 18%

You estimate that 200 people attend a school concert. The actual attendance was 240.   What is the percent error?

• 20%

• 18%

• 16%

• 17%

You guessed that the Chicago Cubs would win 95 games during the regular season. They actually won 103. What was your percent error? Round to the nearest tenth if necessary.

• 7.8%

• 7.7%

• 0.77%

• 0.78%

A ratio that compares a number to 100

• percent change

• product

• rate

• percent