1. The employees of a company were surveyed and asked their educational background and marital status. Of the 600 employees, 400 had university degrees (D), 100 were single (S) and 60 were single university graduates. a) Construct a contingency table for the above problem. [5 marks] b) Find the probability that a randomly selected employee of the company is single or has a university degree. [2 marks] c) What percentage of single employees have university degrees? [3 marks] d) Determine the value of P(D' u S) [2marks] e) Are marital status and educational background statistically independent? Explain. 13 marks]