Q19 of 24 Page 97

On one Sunday Muhil observed the vehicles at a Tollgate in the NH-45 for his science project about air pollution from 7 am. to 7 pm. The number of vehicles crossed are tabulated below.


A vehicle is selected at random. Find the probability that the vehicle chosen is a


(i) a bus at the time interval 7 a.m. to 11 a.m.


(ii) a car at the time interval 11 a.m. to 7 p.m.


(iii) a bus at the time interval 7 a.m. to 3 p.m.


(iv) a car at the time interval 7 a.m. to 7 p. m.


(v) not a two wheeler at the time interval 7 a.m. to 7 p.m.

(i) Total number of vehicle = 2500


No. of buses in the interval 7 am to 11 am = 300




(ii) Total number of vehicle = 2500


No. of cars in the interval 11 am to 7 pm = 130 + 250 = 380




(iii) Total number of vehicle = 2500


No. of buses in the interval 7 am to 3 pm = 300 + 120 = 420




(iv) Total number of vehicle = 2500


No. of cars in the interval 7 am to 7 pm = 200 + 130 + 250 = 580




(v) Total number of vehicle = 2500


No. of non-two-wheelers in the interval 7 am to 7 pm = 2500-(500 + 250 + 350) = 1400




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