Chapter 4: Problem 35
Suppose that \(f(x)=0.25\) for \(0
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Chapter 4: Problem 35
Suppose that \(f(x)=0.25\) for \(0
These are the key concepts you need to understand to accurately answer the question.
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(a) Calculate the mode, mean, and variance of the distribution for \(\alpha=3\) and \(\beta=1.4\) (b) Calculate the mode, mean, and variance of the distribution for \(\alpha=10\) and \(\beta=6.25\). (c) Comment on the difference in dispersion in the distribution from parts (a) and (b).A European standard value for a low-emission window glazing uses 0.59 as the proportion of solar energy that enters a room. Suppose that the distribution of the proportion of solar energy that enters a room is a beta random variable.
Provide approximate sketches for beta probability density functions with the following parameters. Comment on any symmetries and show any peaks in the probability density functions in the sketches. (a) \(\alpha=\beta<1\). (b) \(\alpha=\beta=1\). (c) \(\alpha=\beta>1\).
The lifetime of a mechanical assembly in a vibration test is exponentially distributed with a mean of 400 hours. (a) What is the probability that an assembly on test fails in less than 100 hours? (b) What is the probability that an assembly operates for more than 500 hours before failure? (c) If an assembly has been on test for 400 hours without a failure, what is the probability of a failure in the next 100 hours? (d) If 10 assemblies are tested, what is the probability that at least one fails in less than 100 hours? Assume that the assemblies fail independently. (e) If 10 assemblies are tested, what is the probability that all have failed by 800 hours? Assume that the assemblies fail independently.
An airline makes 200 reservations for a flight that holds 185 passengers. The probability that a passenger arrives for the flight is \(0.9,\) and the passengers are assumed to be independent. (a) Approximate the probability that all the passengers who arrive can be seated. (b) Approximate the probability that the flight has empty seats. (c) Approximate the number of reservations that the airline should allow so that the probability that everyone who arrives can be seated is \(0.95 .\) [Hint: Successively try values for the number of reservations.]
Suppose that \(X\) has a lognormal distribution with parameters \(\theta=10\) and \(\omega^{2}=16\). Determine the following: (a) \(P(X<2000)\) (b) \(P(X>1500)\) (c) Value exceeded with probability 0.7
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