# Probability

Gas Station pump signs, at one chain, encourage customers to have their oil checked, claiming that one out of every four cars should have its oil topped.

a.) What is the probability that exactly 3 of the next 10 cars entering a station should have their oil topped?

b.) What is the probabily that at least half of the next 20 cars entering a station should have their oil topped?

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#### Solution Preview

Probability of a car having its oil topped = p = 1/4 = 0.25

<br>Probability of a car not having its oil topped = q = 1 - 0.25 = 0.75

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<br>a.)

<br>Probability that 3 of 10 ...

#### Solution Summary

Gas Station pump signs, at one chain, encourage customers to have their oil checked, claiming that one out of every four cars should have its oil topped.

a.) What is the probability that exactly 3 of the next 10 cars entering a station should have their oil topped?

b.) What is the probabily that at least half of the next 20 cars entering a station should have their oil topped?