PP-T1-DS113

[Huang Hsin-Yi]

113. 11760-!-item-!-187;#058&007855
For a certain set of n numbers, where n > 1, is the average (arithmetic mean) equal to the median?

(1) If the n numbers in the set are listed in increasing order, then the difference between any pair of successive numbers in the set is 2.

(2) The range of the n numbers in the set is 2(n - 1).

Ans:A

(1)2,4,6,8,10 average=6=midian
2,4,6,8 average=5=/=midian
這樣怎會是A勒?

[smilego]

2,4,6,8 average=5=/=midian

average : (2+4+6+8)/4 = 5
Midian : (4+6)/2 =5

[Huang Hsin-Yi]

我太豬頭了,希望這種事不要發生在實戰上