Answer Happy

The event tree shows the consequences for a system after pumping from a quarry dam fails and is not repaired within one day. (Sourced from internet, ref available) Given the Event Tree below and the values associated with each event, what is the probability that Consequence A happens after the initiating event has occurred? Give the answer to 4 decimal places. Event Probability of "Failure" High water level (Pa) 0.019 Bad weather conditions (Pb) 0.178 Overflow works effectively (Pc, Pd) 0.04 Dam wall fails (Pe, Pf) 0.069 High water level Bad weather conditions Overflow works effectively Dam wall fails AB, C, D, E Pc A, B, C, D, E Pe Pb Pa B, D, E AB, ED Pumping from Quarry Dam fails and is not repaired within 1 day Pa AB, E, CD Pf BED DE Consequences A All stockpile integrity lost B. Threat to stock piles C. Pollution of sea D. Dust Pollution E. Cannot load vessel