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
Engineering   Civil-Engineering   
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Answer #1

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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