Julian and Brittany mailed 275 wedding invitations to family and friends and predicted that they would all attend. Only 265 out of 275 people committed to attending the wedding. Calculate the percent error in their prediction. Round your answer to the nearest hundredth percent.

Question

A. 3.77%
B. 3.63%
C. -4.00%
D. 0.038%

Answer 1

Percent error is calculated using the formula:
(actual - predicted) / predicted * 100

In this case, the actual number of people attending is 265 and the predicted number was 275.

Percent error = (265 - 275) / 275 * 100
= -10 / 275 * 100
= -3.64%

Rounded to the nearest hundredth percent, the percent error in their prediction is 3.64%.

Therefore, the correct answer is A. 3.77%