Soal SMA · Soal cerita · Kesulitan 3/5
A study shows that 40% of people who drink coffee also drink tea, and 30% of people who drink tea also drink coffee. If 50% of the population drinks coffee, what percentage drinks tea?
- A.66.7%
- B.33.3%
- C.50%
- D.40%
Kunci jawaban & pembahasan
Jawaban: 66.7%
Let P(C)=0.5, P(T|C)=0.4, P(C|T)=0.3. P(T) = P(C)*P(T|C)/P(C|T) = 0.5*0.4/0.3 = 0.666... = 66.7%.
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