ProbStatsQuiz3 - EGN 3443 Probability& Statistics for...

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Unformatted text preview: EGN 3443 Probability & Statistics for Engineers Quiz 3 (10 points) Open book/notes, 20 minutes October 22, 2008 Name: 41M HM} gm “5’ mega; «a 14355 Please check below, if applicable APEX 13 Lakeland E] Sarasota Good luck! mumamwrmmwmmmmmwmmwemmxwmwmKrmwmm«awe-MK f: f is“ § § iv, 5 i g 3: § § wummmwawamrwvuwzmvazwflwfil The pdf of the time to failure of an iPhone (in hours) is f 2: e‘w/ 10000 / 10000 for a: > 0. Determine the probability that a) An iPhone lasts more than 8760 hours (one year) before failure. (8’ points) ’30 -— i W 963%“ l S bum 5:” _ “C W 576‘? Z'Gé ; M 3' 3m ) Q!) 53 grad“: [om/Mg r e l V b) An iPhone fails in the interval from 15000 to 20000 hours. (3 points) 2400‘} ,X/maw \mgza: 45”” K P a ““V as} _ 6% ~ C WW - c "’1 " [£1999 0’03 3/ “2., <3 w” ...
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