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A 15-ft diameter wind turbine operates in a 25 ft/sec wind at 1 atm and 60 degrees F. The turbine is used to pump 60 degrees F water from a 30-ft-deep well. How much water (in cubic feet per second) can be pumped if the overall effciency of the wind-turbine pump system is 0.25?
a simple random sample without replacement of 30 households was drawn from a city area containing 14 848 households.
Suppose that distribution of grades has average of 78 with standard deviation of 11. Find the appropriate cutoff points for the grades A and F.
Assume for the sake of this question that GRE scores are normally distributed with a mean of 1000 and a standard deviation of 200. What percentage of students taking the exam will get scores of 1400 or higher?
To assess opinion of students at Ohio State University about campus safety, reporter for student newspaper interviews 15 students she meets walking on campus.
The times needed to fall asleep are assumed to follow a normal distribution. The results for the two nights for the ten volunteers are shown below:
question what is an interaction? describe an example what are the variables within your population work social
Assume grades in college accounting class are normally distributed with a mean of 82 and a standard deviation of 7. what is the probability that a randomly selected student from this class will have a grade lower than 65?
Carry out a t-test to see if the mean healing rate is significantly lower in the experimental limbs, including all 12 newts. What are the test statistics and their P-values?
What is the upper limit of the 95% interval? Give your answer to three decimal places. Which of the following assumptions should be checked before constructing the above confidence interval?
Bonus is sales are made to 3 of the neighbors, and $200 if he able to sell to 4 neighbors. In how many ways can edwards make bonuses greater than $50?
The population of IQ scores forms a normal distribution with a mean of u=100 and a standard deviation with a mean of sigma=15.
Two men are carrying a girl on a large plank that is 10m long and weights 200N. If the girl on a plank weighs 445N and sits 3m from one end, how much weight must each man support?
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