Probability of at least one crash per week


1.) On New York's Verrazano Narrows bridge, traffic accidents occur as a mean rate of 1.0 crash per day. Let X be the number of crashes in a given day.

a) What is the probability of at least one crash per week?

b) If there is an accident on Monday morning at 9:00 a.m. what would the probability of having the next accident by 9:00 p.m. (i.e. the next accident happens after 12 hours)?

2.) If 90 percent of automobiles in Orange County have both headlights working, what is the probability that in a sample of 8 automobiles, at least 7 will have both headlights working?

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Basic Statistics: Probability of at least one crash per week
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