The traffic police recorded the speed (in km/h) of 10 motors as 47, 53, 49, 60, 39, 42, 57, 55, 48 and 52. Later on an error in the recording instrument was found. Find the correct mean speed of the motors if the instrument recorded the speed 6 km/h less in each case.

The traffic police recorded the speed (in km/h) of 10 motors as 47, 53

1.	The traffic police recorded the speed (in km/h) of 10 motors as 47, 53, 49, 60, 39, 42, 57, 55, 48 and 52. Later on an error in the recording instrument was found. Find the correct mean speed of the motors if the instrument recorded the speed 6 km/h less in each case.
A.	55.2 km/h
B.	56.2 km/h
C.	57.2 km/h
D.	58.2 km/h
E.	None of these
Answer» C. 57.2 km/h

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The traffic police recorded the speed (in km/h) of 10 motors as 47, 53, 49, 60, 39, 42, 57, 55, 48 and 52. Later on an error in the recording instrument was found. Find the correct mean speed of the motors if the instrument recorded the speed 6 km/h less in each case.

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