[機統] 請問2題機率問題
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!!!
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