视力 | 4.2及以下 | 4.3~4.6 | 4.7﹣4.9 | 5.0及以上 |
三年级一班 | 1 | 3 | 6 | 33 |
三年级二班 | 2 | 5 | 10 | 28 |
(2)视力低于5.0的三年级一班学生有________人;视力低于5.0的三年级二班学生有________人。
(3)从统计表中你还发现了什么?
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