4.2以下 | 4.3~4.6 | 4.7~4.9 | 5.0以上 | |
男生 | 4 | 9 | 15 | 6 |
女生 | 2 | 3 | 17 | 8 |
(2)视力为4.3~4.6的人数是( )人。
(3)5.0以上的视力是正常视力,低于5.0的有( )人,你想对这些同学说些什么?
(4)这个班男生多还是女生多?多多少人?
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