Can you explain in detail how to solve these answers?

A study was performed to determine if type of cancer differed between blue collar and white collar. A sample of 1000 of each type of worker diagnosed as having cancer as categorized into one of three types of cancer. The results are shown in the following table. Type of Cancer Occupation Lung Stomach Other Total Blue Collar 529 172 299 1000 White Collar 401 1068 531 2000 Total 930 1240 830 3000 A patient was randomly selected from above three thousand patients. Please write the notation for the probability and find the probability for the following guestions 1. What is the probability that he/she is blue collar? 2. What is the probability that he/she has lung cancer? 3. What is the probability that he/she is white collar has lung cancer? 4. What is the probability that he/she has lung cancer or stomach cancer? Distribution (Week 3:1/312/6)