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The math club of some university consists of 6 freshmen, 8 sophomores, 15 juniors and 7 seniors. From these members, five officers need to be chosen for the club. Suppose the officers are selected by faculty at random.
(a) What is the probability that exactly two seniors will be among the officers?
(b) What is the probability that at most two of the officers will be freshmen?
(c) What is the probability that all officers are in the same year?
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Which of the following conditions for inference about a proportion using a confidence interval are violated in this example?
A quality control engineer is interested in the mean length of sheet insulation being cut automatically by machine. The desired length of the insulation is 12 feet. It is known that the standard deviation in the cutting length is 0.15 feet. A sam..
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What's the probability that the sample proportion is within 0.03 of the population proportion?
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