You estimate that 200 people attended a school concert. The actual attendance was 240 people. a. Find the percent error to the nearest tenth of a percent.

The difference (or error) is 240 - 200 = 40

So what percent of 240 is 40?

x% of 240 is 40

x% * 240 = 40

240x = 40

x = 40/240

x =.1666

multiply by 100 to convert to a percentage.

.1666 * 100 = 16.66%

Rounded to the nearest 10th

= 16.7%