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Unformatted text preview: Stat 119 Name____________________________ Sample quiz, chapter 17 & 18 Red id: __________________________ Use the following information for problems 13 A wildlife biologist examines frogs for a genetic trait he suspects may be linked to sensitivity to industrial toxins in the environment. Previous research had established that this trait is found in 1 of every 8 frogs. He collects and examines 12 frogs. 1. Find the probability that exactly three of the frogs examined has this trait 2. Find the probability that at most two of the frogs examined has this trait 3. Find the mean and standard deviation of the probability distribution. 4. An airline, knowing that about 5% of passengers fail to show up for flights, overbooks (sells more tickets than there are seats). Suppose the airline sells 275 seats for a flight. a) Which statement below describes the correct distribution of X= the number of passengers that will fail to show up A. X ~ AN(275, 0.05) B. X ~ N(13.75, 3.6142) C. X ~ B(13.75, 13.0625)X ~ B(13....
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 Spring '07
 Helen
 Statistics, Standard Deviation, Underage Drinking, Harvard College Alcohol Study

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