Question

Irina predicted that she would sell 75 books, but she actually sold 95 books. Which expression would find the percent error?

a) -20/75 * 100%
b) -20/95 * 100%
c) 20/75 * 100%
d) 20/95 * 100%

Answer 1

To find the percent error, use the expression 20/75 * 100%.

Step-by-step explanation:

To find the percent error, we need to calculate the difference between Irina's prediction and the actual sales, and then express it as a percentage of the prediction. The correct expression would be d) 20/75 * 100%.

This is because the difference between the prediction and the actual sales is -20 (negative because the prediction was less than the actual sales), and we divide this by the prediction (75) and multiply by 100% to express it as a percentage.