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Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.3. (Round your answers to four decimal places.)
(a) If the distribution is normal, what is the probability that the sample mean hardness for a random sample of 12 pins is at least 51?
(b) What is the (approximate) probability that the sample mean hardness for a random sample of 45 pins is at least 51?
If the top 15% of the test scores are usually good enough for admission to law school, find the cut off score for gaining admission.
A national survey of restaurant employees found that 75% said work stress had a negative impact on their personal lives. A sample of 100 employees from a popular restaurant chain finds that 68 answer
Suppose that the constraint is not binding. For what values of cD will the dominant firm be an unconstrained monopolist?
Specifically, identify three specific events or issues from his life, how they directly impacted the United States, and their legacy to the nation?
an automatic hopper car loader is set to put 75 tons of coal into each car. the actual weights of coal loaded into each
question a researcher tests 10 individuals before and after an experimental procedure.the results are shown below. how
How large should n be so that Chebyshev's inequality guarantees that the estimate is within 5 centimeters from h, with probability at least 0.99?
Compute the probability distribution of the number of infected but undiscovered people in the population at the time of first discovery of the disease.
Best-selling Books The numbers of copies sold (in millions) for the top ten best-selling books in 2015-2016 are shown in the table.
tudent from the high school is arbitarily selected. Reply the following questions: Determine the probability that the student's ACT score is less than 22?
70% of the girls surveyed had used an online social network, compared to 54% of the boys. What does it mean to say that the difference in proportions is significant?
Draw ogives from the following data and measure the median value and compute the value of arithmetic mean
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