题型:单选题 题类:常考题 难易度:普通
分组 | (10,20] | (20,30] | (30,40] | (40,50] | (50,60] | (60,70] |
频数 | 2 | 3 | x | 5 | y | 2 |
已知样本数据在(20,40]的频率为0.35,则样本数据在区间(50,60]上的频率为( )
40.02 | 40.00 | 39.98 | 40.00 | 39.99 |
40.00 | 39.98 | 40.01 | 39.98 | 39.99 |
40.00 | 39.99 | 39.95 | 40.01 | 40.02 |
39.98 | 40.00 | 39.99 | 40.00 | 39.96 |
(Ⅰ)完成下面的频率分布表,并画出频率分布直方图;
分组 | 频数 | 频率 |
|
[39.95,39.97) | 2 | ||
[39.97,39.99) | 4 | ||
[39.99,40.01) | 10 | ||
[40.01,40.03] | 4 | ||
合计 |
(Ⅱ)假定乒乓球的直径误差不超过0.02mm为合格品,若这批乒乓球的总数为10 000只,试根据抽样检查结果估计这批产品的合格只数.
参加场数 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
参加人数占调查人数的百分比 | 8% | 10% | 20% | 26% | 18% | 12% | 4% | 2% |
估计该校高一学生参加传统文化活动情况正确的是( ).
试题篮