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Computer A can a job in 4 hours. Computer B can do the same job in 2 hours. How long will it take them working together?
A new drug cures 80% of the patients to whom it is administered. It is given to 25 patients. Find the probabilities that among these patients, the following results occur.
Waiting Lines and Queing Theory Models. Customers enter the waiting line at a cafeteria on a first come, first served basis in two serving lines.
a semicircular plate with a radius of 1 sticks straight down into fresh water with the diameter along the surface. Find the force of the water on side of the plate. The weight-density of water is 62.4 lb/ft^3.
Find the average weekly breakdown cost.
A researcher wants to determine if teenage drivers of red automobiles are more likely to run a red light than automobiles of any other color. She stands at a busy intersection and records the colors of automobiles which run red lights.
Explain why vectors QR and RQ are not equivalent. Explain when the elimination method for solving a system of equations is preferable to the substitution method. Give examples.
A car is traveling at 88 km/h when the driver sees an accident 55 m ahead and slams on the brakes. What minimum constant deceleration is required to stop the car in time to avoid a pileup?
Probability questions
A biologist took a count of the number of migrating geese in a state park and recounted the park's population of geese for each of the next six weeks.
If the correlation coefficient r is equal to 0.726, find the coefficient of determination and the coefficient of nondetermination.
Which pair has equally likely outcomes? List the letters of the two choices below which have equal probabilities of success, separated by a comma.
Conditions for Linear transformation. This chapter starts as follows rotations about the origin and all reflections in lines through the origin can be expressed as functions with rules of the form
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