He Yingqin เกิดก่อนปี 1890 อยู่ในอันดับใด
What rank is He Yingqin who was born before 1890?
df = pd.DataFrame(columns=['rank', 'name', 'birth'])
df[(df['name'] == 'he yingqin') & (df['birth'] < 1890)]['rank'].mean()