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从一班级中任取l0名学生做英语口语测试,成绩如下(单位:分)(平均数精确到个位)
76,90,84,86,81,87,86,82,85,83,
则样本平均数等于();样本方差等于().
说明:计算结果时可以使用计算器.

【参考答案】

84;13.2

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