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

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

Answer 1

The correct option is A 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
Total number of motorists taken into account = 10
$\therefore \text{Average}=\frac{500}{10}=50km/hr$