On adult.csv data set: on each one of the 4 groups defined by sex and income values, calculate total number of rows and average age and write results to a CSV file; on each one of the 4 groups defined by sex and income values, calculate the average of all numerical columns; on full input table count: a. rows with missing values in column occupation; b. all rows in column occupation; c. rows with no missing value in column occupation; d. all rows in another column (i.e. marital-status). Notice that this number should be the same as the number in 2.