[問題]og ds no.267(已解決)

[小晃兄]

For a certain set of numbers, where n>1, is the average(arithmetic mean) equal to the median?

(1) If the n numbers in the set are listed in incresasing order, then the difference between any pair of successive numbers in the set is2.

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

答案是A。

不過解答說這兩者必相等，可是我用通式算卻不等，請幫我看看錯在那，謝謝

average=[2a1+(n-1)*2]*n/2n=a1+(n-1)

median=a1+[(n/2)-1]*2=a1+(n-2)

[小晃兄]

median=a1+[(n-1)/2]*2 才對