If set S consists of the numbers 1, 5, -2, 8, and n, is 0 < n < 7 ?
(1) The median of the numbers in S is less than 5.
(2) The median of the numbers in S is greater than 1.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
粗心。median,中位数不是平均数。AB结论是,n在1-5之间,所以满足0-7
(1):中位数1,可能是5,此时n一定小于5,可能小于0,可能大于0,所以条件2单独不充分
(1)+(2):中位数大于1且小于5,所以n为中位数,n在1~5之间,必然在0~7之间,所以两条件和起来充分
粗心,完全没有考虑1+2的情况
-2,1,5,8中位数小于5 ,则n可以是小于-2的一个数,S1不充分;如果中位数大于1,则n可以是大于8的一个数,S2也不充分。如果限定1
条件一得n1
条件1没有考虑到数字可能会是负数的情况
问的是n是不是在0-7之间,而非根据以下条件能否求出n的范围(例如0-7)。
想浅了,没有考虑到条件1也有n是负数的可能