The reading on a car’s speedometer has a maximum error of 4%. The speed limit on a road is listed at 65 miles per hour. The car’s speedometer reads 63 miles per hour. Is it possible that this car is going over the speed limit?
Yes, it is possible that the car is going over the speed limit. Since the maximum error of the speedometer is 4%, the actual speed of the car could be 4% higher than what is shown on the speedometer.
4% of 65 miles per hour is 2.6 miles per hour.
Therefore, if the speedometer reads 63 miles per hour, the actual speed of the car could be 63 + 2.6 = 65.6 miles per hour.
Since 65.6 miles per hour is higher than the speed limit of 65 miles per hour, it is possible that the car is going over the speed limit.