填空题:从一班级中任取10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) 76,90,84,86,81,87,8

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题目内容:
从一班级中任取10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.
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