How do I calculate b and c? I'm having difficulties with those 2?

2. In the College of Business at Big State University 20% of the students major in economics/finance and 80% of the students major in something else. Let the random variable X represent a student's major, with x-1 representing an econ/finance major and x-0 another major. After graduation students in the College of Business earn a low salary, a medium salary, or a high salary, Let the random variable Y represent the salary earned with y 0 representing low salary, I representing medium salary, and y-2 representing high salary, You are given The following f(x 0, y 0) 0.14, f(x-0, y 1) 0.56 and f(x 0.y 2) 0.1. In addition, fly 0) 0.15. f(y 1) 0.6, and fly 2) 0.25. Complete the following table: 0 f(x) 0.8 0.2 Calculate () 21x D C. Calculate f () =1 0)