一道SAT数学题目,要详细解答3,4,6,7,10,12The number n is to be added to t

一道SAT数学题目,要详细解答
3,4,6,7,10,12
The number n is to be added to the list above. If n is an integer, which of the following could be median of the new list of seven numbers?
I. 6
II. 6.5
III. 7
A I only
B II only
C III only
D I and II only
E I, II, and III
Christmast 1年前 已收到4个回答 举报

bachelor_007 春芽

共回答了13个问题采纳率:84.6% 举报

我怎么觉得答案是1和3 only呢.
7个数字的数列,中位数只可能是数列里面的数字,那么6.5就不可能了
然后当n小于或等于6的时候,中位数是6
当n大于或等于7的时候,中位数是7

1年前

2

kevin4woo 幼苗

共回答了1个问题 举报

我个人感觉你题目写错了,你随便选个小等于6的整数放进去中位数是7,你选个大等于7的整数放进去中位数是6所以I和III是对的,可是你选项里面没有。6.5是不可能的……

1年前

2

alexrolly 春芽

共回答了23个问题采纳率:69.6% 举报

C III only
3,4,6,7,10,12六个的和是42,42/7=6,所以(42+n)/7一定大于6,A错。
假设6.5正确,6.5*7=45.5,此时n=3.5非整数,B错
当n=7时,平均数正好=7,符合题意

1年前

1

qiqiseven 幼苗

共回答了222个问题 举报

the answer could be wrong, since only I and III are possible.
median means the number listed in the middle of the sequence; if either 6 or 7 be added to the list, 6 or 7 is exactly the median of t...

1年前

0
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