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What is the mean number of leaking tanks in such samples of

Leakage from underground petrol tanks at service stations can damage the environment. It is estimated that 25% of these tanks leak. 15 tanks are chosen at random, independently of each other, and examined.

i. What is the expected number of leaking tanks?

ii. What is the probability that 10 or more of the 15 tanks leak?

iii. What is the probability that fewer that three leak?

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