These are the instructions:
Confirm that the
REGION column is missing from the 2017 data. Recall that there are 164 rows for the year 2017.
- Select just the rows in
combinedin which the
YEARcolumn equals 2017. Then, select just the
REGIONcolumn. Assign the result to
- Use the
Series.sum()to calculate the total number of missing values in
REGIONcolumn for 2017. Assign the result to
This is the answer of this part:
why does combined goes twice in the answer?