Chapter 8: Problem 64
Give at least one scenario in which you might prefer to model a temperature using a discrete random variable rather than a continuous random variable.
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Chapter 8: Problem 64
Give at least one scenario in which you might prefer to model a temperature using a discrete random variable rather than a continuous random variable.
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The new computer your business bought lists a mean time between failures of 1 year, with a standard deviation of 2 months. Ten months after a repair, it breaks down again. Is this surprising? (Assume that the times between failures are normally distributed.)
Sport Utility Vehicles Following are the city driving gas mileages of a selection of sport utility vehicles (SUVs): \(14,15,14,15,13,16,12,14,19,18,16,16,12,15,15,13\) a. Find the sample standard deviation (rounded to two decimal places). b. In what gas mileage range does Chebyshev's inequality predict that at least \(75 \%\) of the selection will fall? c. What is the actual percentage of SUV models of the sample that fall in the range predicted in part (b)? Which gives the more accurate prediction of this percentage: Chebyshev's rule or the empirical rule?
Must the expected number of times you hit a bull's-eye after 50 attempts always be a whole number? Explain.
If \(X\) is a continuous random variable, what values can the quantity \(P(X=a)\) have?
If a finite random variable has an expected value of 10 and a standard deviation of 0, what must its probability distribution be?
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