问道gwd数学（gwd-22-15）

ozymendias

Q15:
The average (arithmetic mean) of a list of numbers is what percent of the sum of the numbers?
(1)   There are 8 numbers in the list.
(2) The sum ofthe numbers in the list is 100.
                 
A. Statement (1) ALONE issufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE issufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHERare sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE issufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

答案是A，why？

VenciTan

平均数=求和/N，
平均数/求和=1/N
知道N就好

melinda206

如果the list of numbers 是连续数的话那么a答案就足够了~如果不是连续的~我也不明白~求解！··