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On time
A Department of Transportation report about air travel found that, nationwide, 76% of all flights are on time.
Suppose you are at the airport and your flight is one of 50 scheduled to take off in the next two hours. Can you consider these departures to be Bernoulli trials? Explain.
What is the probability that a customer does at least one of these two things?
We have a box of 12 light bulbs. The probability that a particular light bulbs lights on opening is 0.95. This meets the binomial assumptions. Find the probability that 9 light bulbs light up.
If the researchers test 95- newborns for the presence of this gene, would it be unlikely for them to find fewer than 25 children with the gene?
what is the probability that the second contestant will win
If a random sample of 50 stocks from this index reveals an average gain of 11% and standard deviation of 6%, can you reject the magazine's claim in a two-tailed test? What is your p-value?
If the scores are approximately normal with mean 544 and standard deviation 103, what minimum score would a student need in order to score in the top 10% of those taking the test?
For any distribution the score that separates the highest 10% from the rest of scores is called.
Although there is a popular belief that herbal remedies such as ginkgo biloba and ginseng may improve learning and memory in healthy adults, these effects are usually not supported by well-controlled research.
a competency test has scores with a mean of 69 and a standard deviation of 4. a histogram of the data shows that the
Show that there is a (non-Hausdorff) topology on a set X of two points for which the Baire and Borel σ-algebras are different.
If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, what percentage of light bulbs have a life less than 2500 hours?
In a certain college, 33% of the physics majors belong to ethnic minorities. If 10 students are selected at random from the physics majors, that is the probability that no more than 6 belong to an ethnic minority?
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