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

Answer 1

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

Therefore, Average Speed = $\frac{500}{10}$= 50 km/hr