(a) What percent of employees either smoke or have a university degree?

(b) What percent of employees neither smoke nor have a university degree?

(c) What percent of employees smoke?

(d) What percent of employees who have a university degree smoke?

(e) What percent of smokers do NOT have a university degree?

(f) Is whether or not an employee smokes independent of whether or not they have a

university degree? Explain the direction of the dependency between degree and

smoking if one exists. Prove using probability.