Chapter 8: Problem 14
$$ X \text { is the value of the larger number when two dice are rolled. } $$
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Chapter 8: Problem 14
$$ X \text { is the value of the larger number when two dice are rolled. } $$
These are the key concepts you need to understand to accurately answer the question.
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The Blue Sky Flight Insurance Company insures passengers against air disasters, charging a prospective passenger \(\$ 20\) for coverage on a single plane ride. In the event of a fatal air disaster, it pays out \(\$ 100,000\) to the named beneficiary. In the event of a nonfatal disaster, it pays out an average of \(\$ 25,000\) for hospital expenses. Given that the probability of a plane's crashing on a single trip is \(.00000087,{ }^{32}\) and that a passenger involved in a plane crash has a \(.9\) chance of being killed, determine the profit (or loss) per passenger that the insurance company expects to make on each trip. HINT [Use a tree to compute the probabilities of the various outcomes.]
Teenage Marketing In \(2000,18 \%\) of all teenagers in the United States owned stocks or bonds. \(^{48}\) Your brokerage company, TeenStox Inc., is interested in targeting teenagers who do not already own stocks or bonds. a. If TeenStox selects a random sample of 2,000 teenagers, what number of teenagers who do not own stocks or bonds can it expect to find? What is the standard deviation of this number? (Round the standard deviation to one decimal place.) b. Fill in the missing quantities: There is an approximately \(99.7 \%\) chance that between sample will not own stocks or bonds. (Round answers to the nearest whole number.)
In one Finite Math class, the average grade was 75 and the standard deviation of the grades was \(5 .\) In another Finite Math class, the average grade was 65 and the standard deviation of the grades was \(20 .\) What conclusions can you draw about the distributions of the grades in each class?
A uniform continuous distribution is one with a probability density curve that is a horizontal line. If \(X\) takes on values between the numbers \(a\) and \(b\) with a uniform distribution, find the height of its probability density curve.
Suppose you take larger and larger samples of a given population. Would you expect the sample and population standard deviations to get closer or further apart? Explain.
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