Percent error

Question

Semira did a physics activity during which she rolled toy cars down a ramp and measured the distance each car traveled. On one trial, the actual distance that the car traveled was 75 cm. Semira's measurement was too short and had a 12% error. What has her distance measuerment?

Answer 1

We are given that the actual value is 75cm.

 

Semira's value was short by 12% (as a decimal 0.12)

 

Our equation becomes Measurement = 75cm - (75cm x 0.12)

 

M = 75cm - 9cm

 

M = 66cm