P1-DS-58

[nemolee]

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

突然忘了怎解

[Huang Hsin-Yi]

you can assume that there are 100 people in this class, then you could get the answer.

[nemolee]

謝謝 Hsin-Yi

可不可以再借問一下，妳算出來ㄉ~ 是剛好整數嗎? 0. 7 ?
我求出來的是 0.704左右..

下午在求解時，一直算出小數到第三位，是不是答案 0.x0，就表示可以從簡選出一個適合的答案就好了?

謝~

[Huang Hsin-Yi]

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

突然忘了怎解

[nemolee]

呵~ 最近欠客戶的東西用不完，被念的太兇了~ 眼睛快閉起來了~ 沒看到 " approximately "

這題算我白目~~