import pandas as pd
data={'姓名':['小明','夏丽','晶晶','李华'],'语文':[90,66,80,78],'数学':[92,86,75,80]}
dfl=pd.DataFrame(data,columns=['姓名','语文','数学'])
df2=df1[df1.语文>=80]
ans=df2['数学'].mean()
执行该程序段后,ans的值为( )
A.83 | B.83.5 | C.85 | D.92 |
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