单选题 There is a 30 percent probability of rain this afternoon. There is a 10 percent probability of having an umbrella if it rains. What is the chance of it raining and having an umbrella?

A、

A. 33%.
B、

B.9%.
C、

C. 3%.

【正确答案】 C

【答案解析】P(A) =0.30. P(B|A)=0.10. P(AB)=(0.30)(0.10)=0.03 or 3%.