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What is the probability that a sample mean calculated from a sample of 100 individuals will have an average age between 64 and 66 years of age. As in the previous question, the mean age of the population is 65 years of age, and the standard deviation is 2 years. For this problem, be sure to use the z-calculation that is for sample means, and includes the sample size:
What is the probability that the sum of their scores exceeds 1200 and probability that the average of the scores of all 400 student
Use poisson approximation to the binomial distribution to find the probability that among 120 calls recieved by the switchboard.
Sstandard deviation was found to be 3.3 minutes. Is there evidence to reject the manager's claim at alpha =.02? Perform an appropriate hypothesis test.
By letting the period be one month, one has D = 100, Cu = 2.5, Ch= 0.50, Cr = 3.50, Cs= 0.20 and L = 0.75. What is the optimal inventory policy and the total cost of the system under the optimal policy?
A manager wishes to find out whether there is a relationship between the number of radio ads aired per week and the amount of sales of a product. the data for the sample are shown below?
What is the expected total weight of 100 randomly chosen babies? What is the standard deviation of the total weight of 100 randomly chosen babies?
Your supervisor has asked you to conduct a survey about consumers' buying habits. For this task, you surveyed 100 men and 100 women at a local shopping mall.
A machine is set to fill a small bottlewith 9gram of a medicine. A sample of 8 bottles revealed the following amount (g) in each bottle. At the .01 sig level, can we conclude that the mean weight is less than 9 grams?
a recent survey found that 84 of the population has never been a victim of a violent crime. if a sample of 15 is
out of a total of 10 college textbooks estimate the standard deviation of their ages if the oldest textbook is known
Otherwise you lose $1. If you make this wager very many times, what will be the mean outcome?
suppose that john and david are shooting at a target. the probability that john hits the target is 17 and the
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