Basic Python Question

Imagine we have a dataframe, df. What would be the purpose for running code lake the below? (why would we run it?) df.loc[1] to locate all missing values and replace with "missing" there is no method called loc to add 1 to the dataframe to rename of as loc To look for, retrieve a value from df Question 2 4pts Imagine we have a pandas dataframe we have named df. The dataframe consists of 2 columns. - "col1" is 30 values long, and is a random mox of the letters 'a', b', and 'c. - "num1" is also 30 values long, and is a random set of numerical data (all integers). Which of the following would give you the mean of the numerical (num1) column, grouped by the values from column "col1? groupby[num1] on [num2] df. groupby[num1].mean() df.groupby ( 'col1').mean() None of these choices group by the values in "col1