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.

The frequency table of the two-wheelers, three-wheelers and four-wheelers going past during 2:30 pm to 3:30 pm in front of our school is given below:
Vehicle Two-wheelers Three-wheelers Four-wheelers Total
Frequency 12 7 9 28
Total number of vehicles = 28 and number of two- wheelers = 12
Therefore,
P(two – wheelers ) = 12/28 = 3/7
Hence, the probability of two- wheelers is 3/7.