9. 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. Solution:
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 = 18/60 =3/10
