Question

The speed in $kmph$ of 4 bikers are 10, 15, 25, and 20. Then the average speed of the bikers is .

• A. 17.5 $kmph$
• B. 17 $kmph$
• C. 16.5 $kmph$
• D. 18 $kmph$

Answer 1

The correct option is A 17.5 $kmph$

The speeds are 10, 15, 25, and 20 (in $kmph$).
Sum of the speeds = 10 + 15 + 25 + 20 = 70
Number of speeds taken into account $=4$
$\therefore$ Average $=\frac{\text{Sum of the readings}}{\text{Total number of readings}}$
$=\frac{70}{4}$
$=17.5kmph$