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課程名稱︰微積分乙下 課程性質︰系必修 課程教師︰王振男 開課學院:醫學院 開課系所︰醫學系 考試日期(年月日)︰2013/5/21 考試時限(分鐘):30分鐘 是否需發放獎勵金:是,謝謝 (如未明確表示,則不予發放) 試題: 1.(10%)A bin contains 3 different types of disposable flashlights. The      probability the a type 1 flashlight will give over 100 hours of use      is 0.7, with the corresponding probabilties for type 2 and type 3      flashlights being 0.4, 0.3, respectively. Suppose that 20% of the      flashlights in the bin are type 1, 30% are type 2, and 50% are      type 3.    (a) What is the probability that a randomly chosen flashlight will give      more than 100 hours of use?    (b) Given the flashlight lasted for over 100 hours, what is the      conditional probability that it was a type j flashlight, j=1,2,3. 2.(10%)Consider 3 urns. Urn A contains 2 white and 5 red balls; urn B      contains 6 white and 4 red balls; and urn C contains 1 white and 6      red balls. If 1 ball is selected from each urn, what is the      probabilty that the ball chosen from urn A was white, given that      exactly 2 white balls were selected? 答案: 1.(a) 0.41 (b) j=1:14/41;j=2:12/41;j=3:15/41 2.8/11 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.112.240.103
ALegmontnick:done 06/06 00:00