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. 100 km/hr
• C. 75 km/hr
• D. 35 km/hr

Answer 1

The correct option is A 50 km/hr

The average of a dataset is given by
$\text{Average}=\frac{\text{Sum of all the observations}}{\text{Total no. of observations}}.$

$\Rightarrow \text{Average Speed}=\frac{\text{Sum of the Speeds}}{\text{Total number of motorists}}$

$=\frac{48+52+57+55+45+39+61+49+51+43}{10}$

$=\frac{500}{10}$
$=50\text{km/hr}$
Thus, the average speed of the motorists is 50 km/hr.