101年高考 水文學 - 土木

By Susan
at 2012-09-21T17:41
at 2012-09-21T17:41
Table of Contents
想問的是第四題
某地區位於甲、乙兩河的匯流處,當任一河流到達洪水位時,該地區即被淹沒。
甲河到達洪水位之機率為 0.1,乙河到達洪水位之機率為 0.2,又已知甲河到達洪
水位時,乙河到達洪水位之機率為 0.4,分別假設各種情況求該地區淹沒的機率?
我算的是 P(甲^乙)=0.1*0.4=0.04
P(甲U乙)=0.1+0.2-0.04=0.26
也有列出 1.只有甲超過:0.1-0.04=0.06
2.只有乙超過:0.2-0.04=0.16
3.甲乙都超過:0.1*0.4 =0.04
結果這題只拿8分 有人能幫忙找出問題還是我的盲點嗎 謝謝
--
某地區位於甲、乙兩河的匯流處,當任一河流到達洪水位時,該地區即被淹沒。
甲河到達洪水位之機率為 0.1,乙河到達洪水位之機率為 0.2,又已知甲河到達洪
水位時,乙河到達洪水位之機率為 0.4,分別假設各種情況求該地區淹沒的機率?
我算的是 P(甲^乙)=0.1*0.4=0.04
P(甲U乙)=0.1+0.2-0.04=0.26
也有列出 1.只有甲超過:0.1-0.04=0.06
2.只有乙超過:0.2-0.04=0.16
3.甲乙都超過:0.1*0.4 =0.04
結果這題只拿8分 有人能幫忙找出問題還是我的盲點嗎 謝謝
--
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