Question

# For the data given in the table below, Radar Gun 1 is Accurate, Radar Gun 2...

For the data given in the table below, Radar Gun 1 is Accurate, Radar Gun 2 is Repeatable and Radar Gun 3 is Precise. The missing value for Radar Gun 3 Car 2 should most nearly be? You may assume the true speed of all three cars is a constant and equal.

 Speed of a car (mph) A B C Radar Gun 1 Radar Gun 2 Radar Gun 3 Car 1 38 40 37 Car 2 36 40 ? Car 3 40 40 39
 a. 36 b. 40 c. 38 d. 44

The radar gun 2 is repeatable and can not be trustworthy, the radar gun 1 is accurate and can be taken as a reference for the radar gun 3 which is precise. The values of speed obtained in radar gun 3 are almost near to the values obtained in the radar gun 1. Therefore the value of speed for car 2 in radar gun 3 will be near to the value obtained in radar gun 1 which is 36 mph.

Therefore, the correct option is (a)

the options (b), (c), and (d) are not correct because their value is differing from a large gap with respect to the radar gun 1.

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