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 was her distance measurement? (PERCENT ERROR)

Answer 1

Hi Dalinda,

 

 

If X is the distance measured, then

 

(|X - 75|/75)*100% =12%

|X - 75|/75 = 0.12

|X -75| = 9 

 

X - 75 =9  or X = 84 cm

 

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