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A crazy and lazy professor has developed a new grading system to make his life easier. he gives 10% A grades, 80% B grades, and 10% C grades. Last semester students with scores less than 15 received C's and those with scores above 85 received A's. If their scores are normally distributed, what are the mean and standard deviation of the scores?
Milligrams with standard devation s=1.0 milligram. construct a 95% confidence interval for the difference between the mean nicotine content of two brands of cigarettes.
The lifetime of automobile tires of a certain brand are found to follow an exponential distribution with mean 30 (in thousands of miles). Find the probability that one of these tires will last
The following represents a project that should be scheduled using CPM. What is the probability of completing this project within 16 days?
the dice game craps is played as follows. the player throws two dice and if the sum is seven or eleven then she wins.
the laurier companys brand has a market share of 30. suppose that 1000 consumers of the product are asked in a survey
In previous tests, baseballs were dropped 24ft onto a concrete surface, and they bounced an average of 92.84% in. In a test of a sample of 40 new balls, the bounce had a mean of 92.67 in.
a survey showed that 17 of households spend more than 100 per week on groceries. assume the population proportion is
sketch the areas under the standard normal curve over the indicated intervals and find the specific areeas.a. to the
a new simple test has been developed to detect a particular type of cancer. each of the 2000 adults and finds by other
four possibly winning numbers for a lottery-ab-4536 nh-7812 sq-7855 and zy-3221- arrive in the mail. you will win a
The mean monthly demand for steam boilers is 6.8 with a standard deviation of 1.7. Compare the dispersion of these distributions. Which demand pattern has more relative variation? Explain.
a binomial experiment has 10 trials with a probability of success of 0.62 in each trial. what is the standard deviation
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