The median annual personal income by visa stream is presented in the table below. Use this data to answer the following questions a. - d. Median Income in $ Median Income in $ Visa Stream 2015 2017 Skilled 55,248 55,904 Family 36,977 37,413 Humanitarian 29,806 30,365 Other PR 47,977 49,383 Required Tasks: a. Use an appropriate graphical technique to summarize the data above and interpret (2 marks) b. Use an appropriate graphical technique to compare the percentage change of income between 2015 and 2017 by Visa stream. (2 marks) c. Comment on your observations in parts (b).(2 marks) d. Explain why you selected the particular graphical technique in part a and b. (2 marks)