Percent Error

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

• 40/200 = 20%

• -40/200 = -20%

• -40/240 = -16.6%

• 40/240 = 16.6%

You guess that Lebron James would score 35 points during the game. He actually scored 28. Find your percent error.

• 30%
• 33%
• 75%
• 25%

You guessed that there were 256 gumballs in the jar. There were actually 510. Find your percent error. Round to the nearest tenth if necessary.

• 49.8%
• 49.9%
• 50.2%
• 50.3%

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%

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

• (135 - 108)/135 = 20%
• (135 - 108)/108 = 25%
• (108 - 135)/135 = -20%
• (108 - 135)/108 = -25%

The price of a pair of shoes decreases from $45 to $40. What is the approximate percentage of decrease?

• 1%

• 11%

• 13%

• 5%

A printer that normally sells for $125 is on sale for $90. By what percent has the price of the printer been reduced?

• 28%

• 35%

• 30%

• 72%

Lacey bought a new purse that originally cost $25 and is on sale for $15. Find the percent of change in the price in the purse.

• Decrease of 40%
• Decrease of 10%
• Decrease of 30%
• Decrease of 20%