Question

Anson estimated he would need 17 hours to complete his science project. He actually needed 19 1/2 hours. What was his percent error?

Answer 1

A. 12.8%

Explanation:

Because you need to minus the actual number from the estimate number then you divide the answer you get from the actual number then you move down two decimal spaces. Then you will get 12.8%.

Answer 2

percentage error = 12.82%

Explanation:

His estimation was 17 hours to complete his science projects but the real time or actual time should be 19 1/2 hours.

That means his error in estimation is 19 1/2 - 17 = 39/2 -17 = 19.5 - 17 = 2.5 hour

So his percentage error should be = error / actual time × 100

Mathematically,

percentage error = 2.5/ 19.5 × 100

multiplying the numerators

2.5 × 100 = 250

percentage error = 250/19.5

percentage error = 12.82%