I'm learning distribution functions from my course of probabilities, but this is the first time I see a distribution with three variables, as follows:
A company offers three services: A, B and C. They perform them randomly, with probabilities 1/2, 3/10 and 1/5 respectively, and the price of these services are respectively 5, 10 and 20 USD. Per day 4 jobs are performed randomly, determine the distribution function for the daily income of this company.
I would appreciate any feedback to help me get into the problem.