推 starsky822 :原來是我的翻譯有問題XD 10/24 08:11
→ starsky822 :謝謝C大 10/24 08:12
※ 引述《starsky822 (豆漿)》之銘言：
: 老師要求解出上課時的習題，但不是很了解@@"
: 因想了半天想不出來，所以想來尋求各位幫忙!!!
: 問題1
: In a particular community, 70% of the voters are Democrats, and 30% are
: Republicans. Thirty percent of the Republican voters and 60% of the
: Democratic voters favor the incumbent. What is the probability that a
: randomly selected voter from this community is a Republican who favors the
: incumbent?
: 問題2
: The frequency of twin births has been increasing in recent years so that in
: 2000 about 3% of all births were twins. Twins may be either identical or
: fraternal. The probability of a birth being that of identical twins has
: remained fairly constant at 0.4%. What proportion of twin births is identical?
: 在此求助各位的幫忙，先謝謝各位了!!!
: 謝謝!!!
先翻譯
你再想想
對所有生產 生出雙胞胎機率上為大約3%
雙胞胎有分同卵及異卵雙胞台
其中對所有生產 同卵雙胞胎的機率是0.4%
問你在所有雙胞胎中 同卵的比例是多少是多少?
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