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Truck tire life is normally distributed with a mean of 60,000 miles and a standard deviation of 4000 miles. What is the probability that a tire will last 72000 miles or more?
In a class, the grade of a student on an exam is an RV with expectation 60 and variance 16. If the class average is between 55 and 65, with a probability greater than or equal to 0.9, determine the number of students that have taken the exam.
The grades of 20 students are listed in the stem and leaf diagram below. What is the probability of randomly selected student to have a grade more than or equal to 60 and less than or equal to 80.
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
find 99 confidence interval for variance and st deviation of weights of 25 one gallon containers of motor oil ifa
The average weight of 40 randomly selected minivans was 4150 pounds. The standard deviation was 480 pounds. Find the 99% confidence interval of the true weight of the minivans.
Douglas Boats is a supplier of boating equipment for the states of Oregon and Washington.
At a used-book sale, 100 books are adult books and 160 are children's books. Of the adult books, 70 are nonfiction while 60 of the children's books are nonfiction. If a book is selected at random, find the probability that is is:
The average height of flowering cherry trees in a nursery is 11 feet. If the heights are normally distributed with a standard deviation of 1.6, find the probability that a randomly selected cherry tree in this nursery is less than 13 feet tall.
Assume the researcher's rats can be considered an SRS from the population of all laboratory rats. The mean Math SAT score of these students is found to be 560, 80 points higher than the national average.
Acetaminophen is an active ingredient found in more than 600 over the counter and prescription medicines, such as pain relievers, cough suppressants, and cold medications.
Estimate the minimum sample size necessary to estimate the true mean grams of fat to within plus or minus 2 grams with 98 percent confidence.
Sketch the distributions involved, and (c) explain your answer to someone who is familiar with the t test for a single sample but not with the t test for independent means.
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