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Each of the students in three psychology classes recorded the time it took to memorize a list of numbers. The first class of 24 students had an average (arithmetic mean) time of 62 seconds, the second class of 30 students had an average time of 70 seconds, and the third class of 28 students had an average time of x seconds. If the average time for all 82 students was 67 seconds, which of the following statements must be true?
Indicate all such statements.
Indicate all such statements.
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5.2.11 用数字描述数据综合题
以上解析由 考满分老师提供。
