You estimate that your friend is 50 inches tall. That actual height of your friend is 54 inches. Find the percent error.

Answer: - 7.408%

Explanation: The formula for percent error is:

(experimental - theoretical) / theoretical * 100. The experimental value is 50, or your guess. The theoretical value is 54, or the actual value. The theoretical value is the value it should be.

(50-54) / 54 = -.074 * 100 = - 7.408%