题目信息
In a numerical table with 10 rows and 10 columns, each entry is either a 9 or a 10. If the number of 9s in the nth row is $$n - 1$$ for each n from 1 to 10, what is the average (arithmetic mean) of all the numbers in the table?
A:9.45
B:9.50
C:9.55
D:9.65
E:9.70
参考答案及共享解析

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已选答案:
正确答案:
C:9.55
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