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The GPA's of all students enrolled at a large university have an approximately normal distribution with a mean of 3.02 and a standard deviation of .29. Find the probability that the mean GPA of a random sample of 20 students selected from this university is 2.95 or lower.
q1. two different methods were used to determine the yield of a chemical. the experiment was run using eight different
Plot a CDF based on these data. What kind of theoretical distribution do you think would be appropriate for these data? Why?
A sample of 400 bags of dog food which are advertised to contain twenty-five pounds had a mean content weight of 24.5 pounds with a standard deviation of 3 pounds.
A recent election return indicated that 55% voted for a proposal, 40% voted against it, and 5% abstained. What is the probability that a voter either abstained or voted against the proposal?
For a candidate who guesses at all answers, find the mean and variance for the random variable X, the number of correct answers.
a study by hewitt associates showed that 79 of companies offer employees flexible scheduling. suppose a researcher
detemine the probability mass function for x. let the random variable x be equally to assume any of the values 18 14 or
To test the difference between two means using two mean z test.
Determine the regression equation. Interpret the equation. Do more bidders tend to increase or decrease the amount of the winning bid?
the wayne manufacturing company purchases a certain part from suppliers a b and c. suppler a supplies 65 of the parts b
Write down Thiele's differential equation for the reserve, and verify that your answer to (a) satisfies this equation.
Can students save money by buying their textbooks at Amazon.com? To investigate this possibility, a random sample of 15 textbooks used during the Spring 2007 semester at Iowa State was selected.
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