AMC8 2025
AMC8 2025 · Q9
AMC8 2025 · Q9. It mainly tests Averages (mean).
Ningli looks at the $6$ pairs of numbers directly across from each other on a clock. She takes the average of each pair of numbers. What is the average of the resulting $6$ numbers?
Ningli 查看时钟上直接相对的 $6$ 对数字。她计算每对数字的平均值。所得 $6$ 个数的平均值是多少？
(A)
\ 5
\ 5
(B)
\ 6.5
\ 6.5
(C)
\ 8
\ 8
(D)
\ 9.5
\ 9.5
(E)
\ 12
\ 12
Answer
Correct choice: (B)
正确答案：（B）
Solution
This solution uses Gauss Summation.
Our answer is
此解使用高斯求和法。
我们的答案是
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