A team of medical students doing their internship have to assist during surgeries at a city hospital. The probabilities of surgeries rated as very complex, complex, routine, simple or very simple are respectively, 0.15, 0.20, 0.31, 0.26, .08. Find the probabilities that a particular surgery will be rated
(i) complex or very complex
(ii) neither very complex nor very simple
(iii) routine or complex
(iv) routine or simple

Answer

(i) 0.35 (ii) 0.77 (iii) 0.51 (iv) 0.57