安徽省郎溪中学2018_2019学年高二数学上学期期中试题理.doc

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1 -安徽省郎溪中学 2018-2019 学年第一学期高二年级期中考试数学学科试题(理)考试时间:120分钟 总分:150分第卷(选择题)一、选择题:在每小题给出的四个选项中,只有一项是符合题目要求的。本大题共 12 小题,每小题 5 分,共 60 分。2某样本数据的茎叶图如图所示,若该组数据的中位数为 85,平均数为85.5,则 x y( )A12 B13C14 D153下列各数中,最小的是( )A101010 (2) B111 (5) C32 (8) D54 (6)4. 有一人在打靶中,连续射击 2 次,事件“至少有 1 次中靶”的对立事件是( )A.至多有 1 次中靶 B.2 次都中靶 C.2 次都不中靶 D.只有 1 次中靶5. 从甲、乙、丙三人中,任选两名代表,甲被选中的概率为( )A B C D12 13 14 236. 已知 x 与 y 之间的一组数据:x 0 1 2 3

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