GWD数学题请教~谢谢~

linqueen

GWD第八套的16和 17，完全想不明白。谢谢~
Q16:
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.


Q17:
The number of defects in the first five cars to come through a new production line are 9, 7, 10, 4, and 6, respectively.If the sixth car through the production line has either 3, 7, or 12 defects, for which of theses values does the mean number of defects per car for the first six cars equal the median?




I.3
II.7
III.12


A.I only

B.II only
C.III only

D.I and III only

E.I, II, and III

Q17:
The number of defects in the first five cars to come through a new production line are 9, 7, 10, 4, and 6, respectively.If the sixth car through the production line has either 3, 7, or 12 defects, for which of theses values does the mean number of defects per car for the first six cars equal the median?




I.3
II.7
III.12


A.I only

B.II only
C.III only

D.I and III only

E.I, II, and III

hshbaby

是C E么？

hshbaby

不对  E  C。。。

zjz1304

ED?