please help on part B. only

(a) Find the expected number of weeks of labor provided by the company if it wins both bids. Let X denote the number of weeks of electrical work, and Y denote the number of weeks of plumbing work. E(X + Y) = 160 weeks (b) Would you expect to nd positive, negative, or no correlation between the numbers of weeks of the two types of labor needed for the construction? Choose the correct answer below. 0 A. One would expect to nd positive correlation, because delays or extra time for one type of work suggest similar problems in the other type of work as well. 0 B. One would expect to nd negative correlation, because delays or extra time for one type of work suggest less time required for the other type of work. 0 C. There is no correlation between the numbers of weeks of the two types of labor needed for the construction. Click to select your answer and then click Check