From Exercise 1, we also have data on how long each person has been with the company (tenure) categorized into three levels: less than 1 year, between 1 and 5 years, and more than 5 years. A table of the two variables together looks like:

None AA BA MA PhD *1 Year 10 3 50 20 12 1–5 Years 42 9 112 27 15 More Than 5 Years 112 30 63 5 2

a) Find the marginal distribution of the tenure. (Hint: Find the row totals.)

b) Verify that the marginal distribution of the education level is the same as that given in Exercise 1.