12. Frequency Tables for Numerical Columns

data_sizes = [ ]
for row in apps_data[1:]:
    size = float(row[2])
min_size = min(data_sizes)
max_size = max(data_sizes)

When I run this code I get no error message, but when I submit the answer I get: " data_sizes not defined". I do not understand.

Hi @mousa.akkar,

I just attempted to run your code and it is passing the answer checker. May be this issue has been resolved. Can you please try again?