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# 409Hw13 - STAT 409 Fall 2009 Homework#13(due Friday...

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STAT 409 Homework #13 Fall 2009 (due Friday, December 4, by 4:00 p.m.) 1. Seventy percent of the light aircraft that disappear while in flight in Neverland are subsequently discovered. Of the aircraft that are discovered, 60% have an emergency locator, whereas 90% of the aircraft not discovered do not have such a locator. Suppose a light aircraft that has just disappeared has an emergency locator. What is the probability that it will not be discovered? 2. In a certain industry sector, 40% of the stocks went up in January. Of the stocks that went up in January, 80% also went up in February. However, only 30% of the stocks that did not go up in January went up in February. a) What is the probability that a randomly selected stock from this industry sector went up in February? b) Suppose a stock from this industry sector went up in February. What is the probability that it also went up in January? 3.

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409Hw13 - STAT 409 Fall 2009 Homework#13(due Friday...

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