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There is only one copying machine in the student lounge of the business school. Students arrive at the rate of λ=45 per hour? (according to a Poisson? distribution). Copying takes an average of 50 ?seconds, or μ =72 per hour? (according to a negative exponential? distribution).
?a) The percentage of time the machine is used? =
b) The average length of the queue? =
c) The average number of students in the system?
d) The average time spent waiting in the queue?
e)The average time in the system?
While 290 out of 400 in Batavia preferred the same flavor. To test the hypothesis that there was no difference in preferences in the two towns, what is the alternate hypothesis?
A recent study found that the average life expectancy of a person living in Africa is 53 years with a standard deviation of 7.5 years. If a person in Africa is selected at random
A distribution with m = 55 and s = 6 is being standardized so that the new mean and standard deviation will be m = 50 and s = 10. When the distribution is standardized, what value will be obtained for a score of X = 58 from the original distributi..
A real estate investor has two houses: A and B. Each house may increase in value, decrease in value, or remain unchanged. Consider the experiment of investing in the two houses and observing the change (if any) in value:
two cards are drawn from a well-shuffled deck of playing cards from which the spades and clubs have been removed and
What basis of accounting is used to report governmental activities in government-wide financial statements? Can another basis be used? Please explain.
the number of power surges at a nuclear plant follows a poisson distribution with an average of .5 power surgers per
Evaluate the union's claim. Include the hypotheses (both null and alternate), alpha, test statistic (highlight where it is calculated on your spreadsheet), decision, conclusion.
Not take SRS of 25 students who took test. What are the mean and standard deviation of sample mean score xbar of these 25 students?
Group the data in given problem into classes, and draw a histogram of the frequency distribution.- Find the population mean and the population standard deviation.
a. Determine the probability that the watch's battery will last longer than 3.5 years. b. Calculate the probability that the watch's battery will last more than 2.75 years. c. Compute the length-of-life value for which 10% of the watch's batteries la..
A sample proportion is calculated from a sample size of 394. How large of a sample would we need in order to decrease the standard error by a factor of 9?
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