Question

At a car rental agency, 0.40% of the cars are returned on time. A sample of 13 car rentals is studied. What is the probability that more than 3 of them are returned on time?

Write only a number as your answer. Round to 2 decimal places (for example 0.24). Do not write as a percentage.

Answer 1

X : number of car returned on time.

X ~ bin(n,p)

where, n= 13

p = 0.4

q = (1-p) = (1-0.4) = 0.6

the pmf of the distribution be:-

the probability that more than 3 of them are returned on time is:-

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