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[Problem Solving]

试题详情

题目：

A teacher gave the same test to three history classes:  A , B , and C .  The average (arithmetic mean) scores for the three classes were 65, 80, and 77, respectively.  The ratio of the numbers of students in each class who took the test was 4 to 6 to 5, respectively.  What was the average score for the three classes combined?

选项:

A、74
B、75
C、76
D、77
E、78

答案:

B

提问：

ps

解答：

点赞0
阅读2113
解答： sysadmin

提问：

ps

解答：

点赞0
阅读2114
解答： sysadmin老师

提问：

数学

解答：

点赞-1
阅读2115
解答： sysadmin老师

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