(a) Probability that there is no major crime in northern neighbourhood = (1 – 0.418) = 0 .582 Similarly, no minor crime in northern neighbourhood. = (1 – 0.612) = 0.3880 For southern neighbourhood. Probability for no major crime = (1 – 0.355) = 0.645 Probability for no minor crime = (1 – .520) = 0.480 ∴ Probability that there is no crime at all = 0.582 × 0.388 ×0.645 × 0.480 = 0.699.