Question

Activity: Note the frequency of two-wheelers, three-wheelers and four-wheelers going past during a time interval, in front of your school gate. Find the probability that any one vehicle out of the total vehicles you have observed is a two-wheeler.

Answer 1

Lets assume a case:

Number of $2$ wheelers passed $=18$
Number of $3$ wheelers passed $=23$
Number of $4$ wheelers passed $=19$
The time interval is $15$ minutes for all the $3$ conditions.
Total number of vehicles passed $=$ Number of $2$ wheelers $+$ Number of $3$ wheelers $+$ Number of $4$ wheelers
$=18+23+19=60$
Probability that one vehicle out of total vehicles is $2$ wheelers $=\frac{18}{60}=\frac{3}{10}$