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One hundred items are simultaneously put on a life test. Suppose the life-times of the individual items are independent exponential random variables wih mean 200 hours. The test will end when there have been a total of 5 failures. If T is the time at which the test ends, find E[T] and Var(T).
The average speed of greyhound dogs is about 18.8 meters per second. A particular greyhound breeder claims that her dogs are faster than the average greyhound. In a sample of 45 dogs, they ran, on average, 19.2 meters per second with a standard de..
Let F be a field and p(x) and irreducible polynomial over F. Prove that (p(x)) is a prime ideal of F[x]. If R has no divisors of zero, then neither does R[x].
The budgeting process for a Midwestern college resulted in expense forecasts for the coming year (in $ millions) of $9, $10, $11, $12, and $13. Since the actual expenses are unknown, the following respective probabilities are assigned: .3, .2, .25..
Describe the goal of an experimental research study and identify the two elements that are necessary for an experiment to achieve its goal.
question are low carbohydrate diets effective? a random sample of six individuals who wanted to try a low
Suppose that the scores of architects on a particular creativity test are normally distributed. What percentage of architects have Z scores?
If 100 women are randomly selected, find the probability that they have a mean pregnancy between 266 days and 268 days.
question sporty cars are designed to provide better handling acceleration and a more responsive driving experience than
You are asked to match three songs with the performers who made those songs famous. if you guess, the probability distribution for the number of correct matches is:
While exploring data that was collected for an investigation of resources needed for software testing and improvement, you have found an outlier.
Can we conclude from this that most workers there earn between $25 and $35 per hour? Is this the right interpretation for the margin of error?
At some vacation destinations, "all-inclusive" resorts allow you to pay a flat rate and then eat and drink as much as you want. There has been concern about whether these deals might lead to excessive consumption of alcohol by young adults on spri..
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