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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. 50 km/hr
  2. 100 km/hr
  3. 75 km/hr
  4. 35 km/hr


Solution

The correct option is A 50 km/hr
The average of a dataset is given by
Average=Sum of all the observationsTotal no. of observations.

Average Speed =Sum of the SpeedsTotal number of motorists

=48+52+57+55+45+39+61+49+51+4310

=50010
             =50 km/hr   
Thus, the average speed of the motorists is 50 km/hr.

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