The Number of Arrivals at a Local Petrol Station Between

question 28

Essay

The number of arrivals at a local petrol station between 3:00 and 5:00pm has a Poisson distribution with a mean of 12.
a. Find the probability that the number of arrivals between 3:00 and 5:00pm is at least 10.
b. Find the probability that the number of arrivals between 3:30 and 4:00pm is at least 10.
c. Find the probability that the number of arrivals between 4:00 and 5:00pm is exactly two.

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Definitions:

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Hormonal medications taken orally by women to prevent ovulation and thereby avoid pregnancy.

Abstinence

The practice of refraining from some or all aspects of sexual activity for medical, psychological, legal, social, financial, philosophical, or religious reasons.

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Barrier forms of contraception made of latex, polyurethane, or lambskin that cover the penis during sexual activity to prevent pregnancy and reduce the risk of sexually transmitted infections.

Contraception

Methods or devices used to prevent pregnancy as a result of sexual intercourse.