DS-male and brown hair是否考虑为独立事件

bearwinnie

What is the probability that a student randomly selected from a class of 60 students will be a male who has brown hair?

(1)     One-half of the students have brown hair.

(2)     One-third of the students are males.

A	Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B	Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C	BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D	EACH statement ALONE is sufficient.
E	Statements (1) and (2) TOGETHER are NOT sufficient. 如题,是两个独立事件吗?是否选C,最后结果只要相乘即可?越来越糊涂了...

liunaldo1

我觉得不是独立事件  应该选E  因为不知道棕色头发的男生占总男生的比例或占棕色头发学生的比例

frankmfg

E

heroelite

当然 不独立

两个集合可能存在交集，所以不能连乘

答案E

bearwinnie

恩,谢谢了.