PracticeExam1 - Stat 350 Practice Problems for Exam 1...

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Stat 350 Practice Problems for Exam 1 (Spring 2011) First Set 1. Suppose that values are repeatedly chosen from a standard normal distribution. a) In the long run, what proportion of values will be less than 1.06? b) What is the long-run proportion of values that will be between -1.50 and 2.50? c) How large must a value be to be among the largest 20% of all values selected? 2. The pollutants a factory dumps into a river every week has a normally distribution. The factory dumps an average of 2.43 tons of pollutants into a river every week. If the standard deviation is 0.88 tons, what is the probability that in a week more than 3 tons are dumped? 3. The noise level in a restaurant has a normal distribution with = 30 (dB) with = 4 (dB). Find the value c so that 99% of the time the noise level is below c. 4. The amount of coffee dispensed by a certain machine has a normal distribution with = 20 oz and = 2 oz. What container size c will ensure that overflow occurs only 2% of the time?
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This note was uploaded on 04/23/2011 for the course STAT 350 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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PracticeExam1 - Stat 350 Practice Problems for Exam 1...

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