T1-PS 58

[chiungfen]

58. 7090-!-item-!-187;#058&005463
In the graduating class of a certain college, 48 percent of the students are male and 52 percent are female. In this class 40 percent of the male and 20 percent of the female students are 25 years old or older. If one student in the graduating class is randomly selected, approximately what is the probability that he or she will be less than 25 years old?

(A) 0.90
(B) 0.70
(C) 0.45
(D) 0.30
(E) 0.25

ans:B


請大家幫幫忙…

[Huang Hsin-Yi]

0.48*0.6+0.52*0.8

[chiungfen]

hi hi ~~~

so easy... 我計算太粗心，好加在有妳的細心…thanks