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:

57 km/hr

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50 km/hr

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55 km/hr

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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 speeds taken into account = 10

$∴ Average = \frac{500}{10} = 50 k m / h r$

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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 _____.

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