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Thu 28 Jul, 2005 04:00 pm
A car insurance company has determined that 9% of all drivers were
involved in a car accident last year. Among the 12 drivers living on one
particular street, 3 were involved in a car accident last year.
a) If 12 drivers are randomly selected, what is the probability of
getting 3 drivers who were involved in a car accident last year.
b) If 12 drivers are randomly selected, what is the probability of
getting at(least) 3 drivers who were involved in a car accident last year.
I tried using different probability formulas but to no avail. I am seeking the proper formulas to use and then I can take it from there.
Doesn't your teacher give you an idea of what's involved before springing these problems on you? The first thing to notice about this problem is that the probability that a randomly selected driver was involved in a car accident last year is .09.
Now look up Bernoulli trials and/or the binomial probability distribution.
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