Question

Leakage from underground gasoline tanks at service stations can damage the environment. it is estimated that...

Leakage from underground gasoline tanks at service stations can damage the environment. it is estimated that 25% of these tanks leak. you examine 15 tanks chosen at random, independently of each other.

1) what is the probability that 5 tanks leak

2) what is the probability that less than 4 tanks leak

3) given that less than 4 tanks leak, which is the probability that exactly 3 leak?

Math   Statistics-And-Probability   
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Answer #1

The probability of leakage is 0.25 = 1/4

Let X follow Binomial (15, 1/4)

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