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Alice has two identical personal computers, which she never uses at the same time. She uses one PC at a time and the other is a backup. If the one she is currently using fails, she turns it off, calls the PC repairman and turns on the backup PC. The time until either PC fails when it is in use is exponentially distributed with a mean of 50 hours. The time between the moment a PC fails until the repairman comes and finishes repairing it is also exponentially distributed with a mean of 3 hours. What is the probability that Alice is idle because neither PC is operational?
A regression of height (X, in inches) on hourly earnings (Y, in dollars), yields the following results: What is the value of b1 in the regression Y = b0 + b1X?
Is the GPA of this year's students significantly different from the long-run average? At what alpha level would it be significant?
Since the passage of the Staggers Rail Act of 1980, there has been an increase in the number of small railroads (Class III). Why has this number increased while the number of Class I railroads has decreased?
How should the claims processing firm organize their claims processing? Prepare a linear decision model to help the firm organize their processing.
What percentage of the checkout times was at least 4 minutes? Calculate the mean of this frequency distribution. Calculate the standard deviation of this frequency distribution
What does this indicate about how the purchasing power of 1 Ruble changed between 2010 and 2017?
What is the test statistic? Give answer to three decimal places What is the critical value? Give answer to three decimal places. The proper conclusion is to reject H0.
Acing the first test Here are the scores of Mrs. Liao's students on their first statistics test: How did the students do on Mrs. Liao's first test?
Participants is approximately a normal distribution with a mean of 68 years and a standard deviation for 3.5 years. What proportion of the plan recipents die before they reach the standard retirement age of 65.
A chemical engineer desiring to study the evaporation rate of water from brine evaporation beds obtained data on the number of inches of evaporation in each of 55 July days spread over 4 years. Find the sample mean
Researchers suspected that the ability to correctly estimate the size of an object using your hands with your eyes closed is related to whether
In the new poll, if the proportion favoring the incumbent has not changed, what is the mean and standard deviation of the number preferring the incumbent?
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