A petrol attendant recorded the number of vehicles that bought petrol from him for -3 hours and recorded 12 cars and 27 buses. What is the probability that the next vehicle will be a bus?
A
\(\frac{4}{39}\)
B
\(\frac{4}{13}\)
C
\(\frac{5}{13}\)
D
\(\frac{6}{13}\)
E
\(\frac{9}{13}\)
Verified Correct Answer: E.
Step-by-Step Mathematical Solution
Prob = \(\frac{ no of expected outcome}{ no of total outcome}\)
no of cars = 12, no of buses = 27
no of total outcome = 12 + 27 = 39
no of expected outcome = 27
Prob( next vehicle will be bus) = \(\frac{27}{39} = \frac{9}{13}\)
Source: Myschool Past Questions Archive (Record #42062)