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Question

A person recorded the speed (in km/hr) of 10 motorists as 48, 52, 57, 55, 45, 39, 61, 49, 51 and 43. The average speed of the motorists is .
  1. 57 km/hr 
  2. 50 km/hr
  3. 55 km/hr
  4. 54 km/hr


Solution

The correct option is B 50 km/hr
The speeds are 48, 52, 57, 55, 45, 39, 61, 49, 51 and 43 (in km/hr)
Sum of the speeds
 =48+52+57+55+45+39+61+49+51+43=500
Number of motorists whose speeds were taken into account = 10
Average Speed =50010=50 km/hr

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