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An airline maintenance base wants to make a change in its overhaul operation. The present situation is that only one airplane can be repaired at a time, and the expected repair time is 36 hours, whereas the expected time between arrivals is 45 hours. This situation has led to frequent and prolonged delays in repairing incoming planes, even though the base operates continuously. The average cost of an idle plane to the airline is $3,000 per hour. It is estimated that each plane goes into the maintenance shop 5 times per year. It is believed that the input process for the base is essentially Poisson and that the probability distribution of repair times is Erlang, with shape parameter k = 2.
Alternative A is to provide a duplicate maintenance shop, so that two planes can be repaired simultaneously. The cost, amortized over 5 years, is $400,000 per year for each of the airline's airplanes. Alternative B is to replace the present maintenance equipment by the most efficient (and expensive) equipment available, thereby reducing the expected repair time to 18 hours. The cost, amortized over 5 years, is $550,000 per year for each airplane. Which alternative should the airline choose?
Give a better segmentation than either the intensity based or the motion based segmentation. How does the brain combine the two different segmentations cues into a single segmentation?
Tthe amount is approximately normally distributed with a mean of 16 and a standard deviation of 1.5. What percent of the cups will have 15 oz or fewer?
If a technical assistant is randomly selected, what is the probability that she would like to have MAC, given that she would like to have a PC as well?
a die is loaded and a 6 comes up with probability 1?4. if the die is tossed twelve times find the probability thata the
A financial analyst is interested in estimating the average amount of a foreign loan by U.S. banks. Construct the Stratum weights for proportional allocation
Use the data set for math education and conduct an ANOVA to see if there are any statistically significant differences with respect to problem solving total for students who have different categories of the concept of learning by themes (colcateg)..
1. given that z is a standard normal variable pz gt -1.61 is ?2. if x has a normal distribution with mean 100 and
Leasing agents from the Triangle Mall Management Corporation have suggested that Sunflowers Apparel considered several locations in some of Triangles newly renovated lifestyle malls that cater to shoppers with higher than mean disposable income.
The maximum allowable payback and discounted payback statistic for the project are 2 and 2.5 years, respectively. Use the NPV decision rule to evaluate this project; should it be accepted or rejected?
A researcher wishes to estimate with 95% confidence, the proportion of adults who have high speed internet. Her estimate must be accurate within 2% of the true proportion. a) Find the minimum sample size needed using the previous study that sh..
A report states that 46% of home owners had a vegetable garden. How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 3% with 96% confidence?
Employees of a local company are classified according to gender and job type. The following table summarizes the number of people in each job category.
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