Data aggregation. Find the average number of immigrants for each area in a given year. Write a function named mean_area that, given a year between 1980 and 2013, return a series of the average number of immigrants for each area 1: M1 31: M 1 " sample code to test your answer 2 mean_area(199e) Out [8]: Question 4(15pts) Find the top 3 origins withm maximurn number of immigrants for each area. Write a function named get_top3 that, given a year between 1980 and 2013 , returns the records of 109 origins wath the maximum number of immiggantis each aroa