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A collection of all the test scores for a standardized, post-secondary examination administered in the 1970's across countries along the West African coast, is well-modeled as a random variable X ∼ N (μ, σ2) with μ = 270 and σ = 26. If a score of 300 or higher is required for a "pass- with-distinction" grade, and a score between 260 and 300 is required for a "merit-pass" grade, what percentage of students will receive the "distinction" grade and what percentage will receive the "merit" grade?
The marketing manager of a company that manufactures and distributes farming equipment (such as combine harvesters, ploughs and tractors) recorded the number of farming units sold quarterly for the period 2008 to 2011.
suppose alice flips three fair coins and let x be the number of heads showing. suppose barbara flips five fair coins
Construct a 90 percent confidence interval for the true mean weight. (b) What sample size would be necessary to estimate the true weight with an error of ± 0.03 grams with 90 percent confidence?
The International Air Transport Association surveys business travelers to develop quality ratings for transatlantic gateway airports.
a research study has stated that the taxes paid by individuals is correlated at a .78 value with the age of the
a track star runs two races on a certain day. the probability that he wins the first race is 0.7 the probability that
compute the present value of a five-year 6 amp 10 coupon bond with a face value of 1000. what happens when the interest
according to survey conducted by td ameritrade one out of four investors have exchange-traded funds in their
find The probability that it is at least two hours until the first failure occurs, The probability that it is no more than six hours until the first failure occurs and The average time to the first failure.
Moving until all the nodes 1,2,......,m have been visited at least once. Starting at node 0, find the probability that node i is the last node visited, i=1,.....m.
A population is normally distributed with the mean of 100 and a standard deviation of Would it be unusual for mean of sample of 3 to be 115 or more? Why or why not?
experiment consists of tossing a coin h t and then selecting a vowel a e i o u.a. what is the sample space in this
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