编号 | 成绩 | 等级 | 编号 | 成绩 | 等级 |
| 95 | A | ⑥ | 76 | B |
| 78 | B | ⑦ | 85 | A |
| 72 | C | ⑧ | 82 | B |
| 79 | B | ⑨ | 77 | B |
| 92 | A | ⑩ | 69 | C |
请回答下列问题:
(1)孔明同学这次测试的成绩是87分,则他的成绩等级是 ;
(2)请将条形统计图补充完整;
(3)已知该校所有参加这次测试的学生中,有60名学生成绩是A等,请根据以上抽样结果,估计该校参加这次测试的学生总人数是多少?
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2