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 .
A
57 km/hr
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B
50 km/hr
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C
55 km/hr
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D
54 km/hr
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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=50km/hr.