4 a) Explain Mean imputation b) Fill out the missing values in following table x1 x2 x3 2 6 Indiana 5 - - - 4 Indiana 3 3 New York 7 - - 5 1 California - 8 New York 9 12 Illinois 10 - - 23 New York 4 3 California 5 - - 13 - Texas Note: Show all steps during your calculations The dashes indicate blanks in the table