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Fuel Consumption and Cars Even though automobiles are becoming more fuel-efficient, the cost of gasoline is still taking a huge chunk of our personal income. According to the U.S. Energy Information Administration, the mean amount spent on gasoline in 2012 was $2912.29 A random sample of U.S. households was obtained, and each was asked for the amount (in dollars) spent on gasoline during the last year. Is there any evidence to suggest that the data are from a non-normal distribution?
a tire manufacturer guarntees that the mean life of a certain type of tires is at least 35000 miles.a. state the null
So the total length of the assembly is roughly Normal. What is the natural tolerance for the total length? It is not d1 + 2d2, because standard deviations don't add.
suppose diameters of trees in a particular forest are normally distributed with a mean of 18.4 inches and a standard
An observation from a normally distributed population is considered "unusual" if it is more than 2 standard deviations away from the mean. There are several contaminants that can harm a city's water supply.
A research company has designed three different systems to clean up oil spills. The following table contains the results, measured by how much surface area (in square meters) is cleared in 1 hour. The data were found by testing each method in seve..
People are arriving at a party one at a time. While waiting for more people to arrive they entertain themselves by comparing their birthdays.
What is the average number of callers waiting to place an order? (c) Ashleys is considering adding a second clerk to take calls. The store would pay that person the same $ 10 per hour. Should it hire another clerk?
What percentage of the pins will be acceptable to the consumer? In order to improve percentage accepted, the production manager and the engineers discuss.
a) What is the probability that the sample average of the 16 textbooks is less than 3.5 pounds? (use 2 decimal places in your answer)) b) Imagine the distribution of all possible samples averages of textbook weights (with ). What is the weight th..
This is a simplified inventory problem. Suppose that it costs c dollars to stock an item and that the item sells for s dollars.
a. Formulate the given problem as a linear programming problem? b. The following is the final simplex tableau for the above problem:
a catalog company that receives the majority of its orders by telephone conducted a study to determine how long
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