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A student must pass a placement exam to get into a needed class. Suppose the student guesses on all the answers and therefore has only 10% chance of passing the test each time.
a) What is the expected number of times the student will need to take the test before passing?
b) What is the probability that the student takes the test only once or twice?
question the president of a company that manufactures drywall wants to analyze the variables that affect demand for his
Let X1 and X2 denote the proportion of two different chemicals found in a sample mixture of chemicals and used as an insecticide. Suppose X1 and X2 have the joint probability density function given by:
At 99% confidence, test to determine if there is sufficient evidence to indicate that process 2 takes a significantly longer time to manufacture the Zip drives.
Compare two month moving average also exponential smoothing using MAD. The subsiquent data represents demand for company ABC's products for the last 10 months.
Acme plumbing supply just received a shipment of 5,000 stainless steel valves, but 50 regular steel valves were also sent. There is no way to tell the difference between the valves.
If the weekly salaries are normally distributed, estimate the fraction of employees that make more than $300 per week.
Suppose that a certain college class contains 45 students. Of these, 26 are sophomores, 25 are chemistry majors, and 7 are neither. What is the probability that the student is both a sophomore and a chemistry major?
the first internet bank wants to encourage its customers to do all their banking online. it offers higher interest to
give and describe an example of an interval measurement
If W denotes the total number of spaces one moves under these special conditions, find the mean and standard deviation of W.
on tuesday april 15th 2014 gallup reported that 43 of americans approve of the job barack obama is doing as president.
how large a sample should be surveyed to estimate the true proportion of college students who do laundry once a week
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