【单选题】已知一组数据14, 15, 15, 16, 19, 20, 20, 21, 22, 23, 25, 25, 25, 25, 29, 31, 34, 35, 35, 35, 35, 37, 40, 45, 47, 52, 70,其上四分位数Q1是()。
A. 14 B. 20 C. 25 D. 35
A. 14 B. 20 C. 25 D. 35
举一反三
- 已知一组数据14, 15, 15, 16, 19, 20, 20, 21, 22, 23, 25, 25, 25, 25, 29, 31, 34, 35, 35, 35, 35, 37, 40, 45, 47, 52, 70,其下四分位数Q3是
- 用某种排序方法对线性表(25, 84, 21, 47, 15, 27, 68, 35, 20)进行排列时,元素序列的变化情况如下: (1) 25, 84, 21, 47, 15, 27, 68, 35, 20 (2) 20, 15, 21,25, 47, 27, 68, 35, 84 (3) 15, 20, 21, 25, 35, 27, 47, 68,84 (4) 15, 20, 21, 25, 27, 35, 47, 68, 84 则所有的排序方法是( )。
- 【单选题】水稻田灌溉水温为() A. 15~20°C B. 15~25°C C. 20~35°C D. 15~35°C
- 溴化锂循环冷却水入口温度控制在( )范围内。 A: 15℃-20℃ B: 20℃-25℃ C: 25℃-35℃ D: 35℃-45℃.
- 农作物种子催芽的适宜温度为()。 A: 15~20℃ B: 20~25℃ C: 25~35℃ D: 35~40℃