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### exam2

Course: M 203, Fall 2009
School: UNL
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Word Count: 376

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203 Math Exam 2 Fall 1994 There are 6 problems, each of which is worth 16 points. You get 4 points for correctly filling in your name. Name 1. A herpetologist finds that the mean weight of adult lounging tweeter frogs is 45 grams, with a standard deviation of 2 grams. What fraction of the frogs have weight in excess of 51 grams? One hundred frogs are selected at random and shipped to deserving zoos and gourmands...

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203 Math Exam 2 Fall 1994 There are 6 problems, each of which is worth 16 points. You get 4 points for correctly filling in your name. Name 1. A herpetologist finds that the mean weight of adult lounging tweeter frogs is 45 grams, with a standard deviation of 2 grams. What fraction of the frogs have weight in excess of 51 grams? One hundred frogs are selected at random and shipped to deserving zoos and gourmands around the world. It is found that the mean weight of the frogs in this sample is 46 grams. Is this surprising? Document your conclusion with an appropriate calculation. 2. Carefully draw a normal curve with a mean of and a standard deviation of . Be certain to label the scale along the bottom. Shade in the top of the area under the curve. 3. In order to get information about steroid use amongst Nebraska high school wrestlers involved in competition, officials at wrestling events arrange for blood samples to be taken from 100 randomly selected wrestlers. It is found that 10 have used steroids recently. Using the data from this survey, construct a 95% confidence interval for the fraction of wrestlers who use steroids. The Legislature passes a bill which requires all that high school wrestlers (involved in competition) complete a confidential questionnaire regarding their steroid use. It is found that 5.2% of wrestlers have used steroids. Based on this, the blood sampling is halted. Comment. Your conclusions for this problem (including the confidence interval results) must be clearly stated in the form of a short essay, using complete sentences. 4. A fair coin is flipped four times. What is the probability that heads will turn up exactly twice? 5. A machine fills bags with brussel sprouts, for distribution to school cafeterias. Ten bags are selected at random, and then each bag is weighed. The weights in kilograms are , , , , , , , , , and . Construct ...

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